correct history order on history page

Reviewed-on: https://gitea.micialware.ru/micialware/jap_learn/pulls/19

Cargo.toml

@@ -1,23 +1,23 @@
 [package]
 name = "jap_learn"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2024"
 
 [dependencies]
-iced = { version = "0.14.0", features = ["tokio", "svg", "lazy"]}
+iced = { version = "0.14.0", features = ["tokio", "svg", "lazy", "crisp", "tiny-skia", "wayland", "wgpu"], default-features = false}
 iced_core = "0.14.0"
-rand = "0.10.2"
-dirs = "6.0.0"
+rand = "0.10.3"
+dirs = "7.0.0"
 serde_json = "1.0.151"
-rhai = { version = "1.25.1", features = ["sync"] }
+rhai = { version = "1.26.1", features = ["sync"] }
 chrono = "0.4.45"
 rusqlite = { version = "0.40.2", features = ["chrono", "bundled"] }
-reqwest = { version = "0.13.4", features = ["json", "stream", "multipart"] }
+reqwest = { version = "0.13.5", features = ["json", "stream", "multipart"] }
 rodio = "0.22.2"
 sha2 = "0.11.0"
-tokio = { version = "1.53.1", features = ["rt", "rt-multi-thread", "macros"] }
+tokio = { version = "1.53.2", features = ["rt", "rt-multi-thread", "macros"] }
 hex = "0.4.3"
-zstd = "0.13.3"
+zstd = "0.14.1"
 zip = "8.6.0"
 rfd = "0.17.2"
 mimalloc = "0.1.52"
@@ -26,20 +26,17 @@ rayon = "1.12.0"
 parking_lot = "0.12.5"
 env_logger = "0.11.11"
 log = "0.4.34"
+fsrs = "6.6.2"
+litemap = { version = "0.8.3" }
 
 [profile.super-release]
 inherits = "release"
 codegen-units = 1
 lto = true
 opt-level = 3
-strip = true
+#strip = true
 panic = "abort"
 
 [dev-dependencies]
 criterion = { version = "0.8.2", features = ["html_reports"] }
-
-[[bench]]
-name = "map_bench"
-harness = false
-
-
+rustc-hash = "2.1.3"

benches/map_bench.rs

@@ -1,126 +0,0 @@
-use criterion::{Criterion, criterion_group, criterion_main};
-use std::collections::HashMap as StdHashMap;
-use std::hint::black_box;
-
-use hashbrown::HashMap as BrownHashMap;
-
-const SIZES: [usize; 3] = [5, 10, 50];
-const QUERY_COUNT: usize = 4096;
-
-/// Детерминированный ключ ~17 символов, например "key_9e3779b9_0042".
-fn make_key(i: u64) -> String {
-    let h = i.wrapping_mul(0x9E37_79B9_7F4A_7C15);
-    format!("key_{:08x}_{:04}", h & 0xFFFF_FFFF, i)
-}
-
-// Для длинных ключей (пути/URL) замени на:
-// fn make_key(i: u64) -> String {
-//     format!(
-//         "/api/v2/users/{i}/settings/visibility_{:08x}",
-//         i.wrapping_mul(0x9E37_79B9)
-//     )
-// }
-
-fn make_vec(n: usize) -> Vec<(String, u64)> {
-    (0..n as u64).map(|i| (make_key(i), i)).collect()
-}
-
-fn make_std_map(data: &[(String, u64)]) -> StdHashMap<String, u64> {
-    data.iter().map(|(k, v)| (k.clone(), *v)).collect()
-}
-
-fn make_brown_map(data: &[(String, u64)]) -> BrownHashMap<String, u64> {
-    data.iter().map(|(k, v)| (k.clone(), *v)).collect()
-}
-
-fn make_queries(n: usize, with_misses: bool) -> Vec<String> {
-    let keys: Vec<String> = (0..n as u64).map(make_key).collect();
-    let missing = "__missing_key__".to_string();
-
-    (0..QUERY_COUNT)
-        .map(|i| {
-            if with_misses && i % 16 == 15 {
-                missing.clone()
-            } else {
-                let idx = i.wrapping_mul(2_654_435_761) % n;
-                keys[idx].clone()
-            }
-        })
-        .collect()
-}
-
-fn lookup_std(map: &StdHashMap<String, u64>, queries: &[String]) -> u64 {
-    let mut sum = 0u64;
-    for q in queries {
-        match map.get(black_box(q.as_str())) {
-            Some(v) => sum = sum.wrapping_add(*v),
-            None => sum = sum.wrapping_add(1),
-        }
-    }
-    black_box(sum)
-}
-
-fn lookup_brown(map: &BrownHashMap<String, u64>, queries: &[String]) -> u64 {
-    let mut sum = 0u64;
-    for q in queries {
-        match map.get(black_box(q.as_str())) {
-            Some(v) => sum = sum.wrapping_add(*v),
-            None => sum = sum.wrapping_add(1),
-        }
-    }
-    black_box(sum)
-}
-
-fn lookup_vec(data: &[(String, u64)], queries: &[String]) -> u64 {
-    let mut sum = 0u64;
-    for q in queries {
-        let q = black_box(q);
-        match data.iter().find(|(k, _)| k == q) {
-            Some((_, v)) => sum = sum.wrapping_add(*v),
-            None => sum = sum.wrapping_add(1),
-        }
-    }
-    black_box(sum)
-}
-
-fn bench(c: &mut Criterion) {
-    let mut group = c.benchmark_group("map_vs_vec_str");
-
-    for n in SIZES {
-        let vec_data = make_vec(n);
-        let std_map = make_std_map(&vec_data);
-        let brown_map = make_brown_map(&vec_data);
-
-        let queries_hit = make_queries(n, false);
-        let queries_mixed = make_queries(n, true);
-
-        // std::collections::HashMap (SipHash)
-        group.bench_function(format!("std_hashmap_hit/{n}"), |b| {
-            b.iter(|| lookup_std(black_box(&std_map), black_box(&queries_hit)))
-        });
-        group.bench_function(format!("std_hashmap_mixed/{n}"), |b| {
-            b.iter(|| lookup_std(black_box(&std_map), black_box(&queries_mixed)))
-        });
-
-        // hashbrown (SwissTable + foldhash)
-        group.bench_function(format!("hashbrown_hit/{n}"), |b| {
-            b.iter(|| lookup_brown(black_box(&brown_map), black_box(&queries_hit)))
-        });
-        group.bench_function(format!("hashbrown_mixed/{n}"), |b| {
-            b.iter(|| lookup_brown(black_box(&brown_map), black_box(&queries_mixed)))
-        });
-
-        // Vec<(String, u64)>, линейный поиск
-        group.bench_function(format!("vec_linear_hit/{n}"), |b| {
-            b.iter(|| lookup_vec(black_box(&vec_data), black_box(&queries_hit)))
-        });
-        group.bench_function(format!("vec_linear_mixed/{n}"), |b| {
-            b.iter(|| lookup_vec(black_box(&vec_data), black_box(&queries_mixed)))
-        });
-    }
-
-    group.finish();
-}
-
-criterion_group!(benches, bench);
-criterion_main!(benches);

sql/card_set.sql

@@ -1,9 +0,0 @@
-create table card_set
-(
-    id       INTEGER
-        primary key autoincrement,
-    name     TEXT not null,
-    forward  TEXT not null,
-    backward TEXT not null,
-    filter   TEXT not null
-);

sql/card_stats.sql

@@ -1,13 +0,0 @@
-create table card_stats
-(
-    id          INTEGER
-        primary key autoincrement,
-    word_id     INTEGER           not null
-        references words
-            on delete cascade,
-    set_id      INTEGER              not null
-        references card_set
-            on delete cascade,
-    score       INTEGER default 1 not null,
-    last_opened INTEGER           not null
-);

sql/custom_fields.sql

@@ -0,0 +1,6 @@
+create table custom_fields
+(
+    id            integer primary key,
+    name          text not null,
+    identifier text not null
+);

sql/decks.sql

@@ -0,0 +1,9 @@
+create table decks
+(
+    id       integer
+        primary key autoincrement,
+    name     text not null,
+    forward  text not null,
+    backward text not null,
+    filter   text not null
+);

sql/exam.sql

@@ -0,0 +1,5 @@
+create table exams(
+    id integer primary key,
+    timestamp integer,
+    deck_id integer  not null references decks on delete cascade
+);

sql/exam_entry.sql

@@ -0,0 +1,7 @@
+create table exam_entries
+(
+    id      integer primary key,
+    exam_id integer not null references exams on delete cascade,
+    word_id integer not null references words on delete cascade,
+    status integer default null
+);

sql/history.sql

@@ -0,0 +1,12 @@
+create table history
+(
+    id        integer
+        primary key autoincrement,
+    deck_id   integer not null references decks on delete cascade,
+    word_id   integer not null references words on delete cascade,
+    timestamp integer not null,
+    answer    integer not null,
+    before    integer not null,
+    after     integer not null,
+    fsrs      integer not null
+);

sql/states.sql

@@ -0,0 +1,16 @@
+create table states
+(
+    id            integer
+        primary key autoincrement,
+    word_id       integer           not null
+        references words
+            on delete cascade,
+    deck_id       integer           not null
+        references decks
+            on delete cascade,
+    score         integer default 1 not null,
+    last_opened   integer           not null,
+    fsrs_opened   integer           not null,
+    fsrs_memory   integer           not null,
+    fsrs_open_day integer           not null
+);

sql/word_group.sql

@@ -1,6 +0,0 @@
-create table word_group
-(
-    id   INTEGER
-        primary key autoincrement,
-    name TEXT not null
-);

sql/word_groups.sql

@@ -0,0 +1,6 @@
+create table word_groups
+(
+    id   integer
+        primary key autoincrement,
+    name text not null
+);

sql/words.sql

@@ -1,13 +1,13 @@
 create table words
 (
-    id       INTEGER
+    id       integer
         primary key autoincrement,
-    key      TEXT              not null,
-    value    TEXT              not null,
-    tags     TEXT              not null,
-    more     TEXT,
+    key      text              not null,
+    value    text              not null,
+    tags     text              not null,
+    more     text,
     group_id integer default 1 not null
-        constraint words_word_group_id_fk
-            references word_group
+        constraint words_word_groups_id_fk
+            references word_groups
             on update cascade on delete cascade
 );

src/app.rs

@@ -1,21 +1,25 @@
-use crate::data::Id;
-use crate::data::entities::DeckSettings;
-use crate::data::entities::{WordData, WordGroup};
-use crate::data_provider::card_sets::load_sets;
+use crate::data::repositories::Repository;
+use crate::data_provider::card_states::CardStateRepository;
+use crate::data_provider::custom_fields::CustomFieldRepository;
+use crate::data_provider::decks::DeckRepository;
+use crate::data_provider::history::HistoryRepository;
 use crate::data_provider::settings::get_setting;
-use crate::data_provider::sqlite::default_connection;
-use crate::data_provider::words::{load_word_groups, load_words};
+use crate::data_provider::sqlite::SqliteConnection;
+use crate::data_provider::word_groups::WordGroupRepository;
+use crate::data_provider::words::WordRepository;
 use crate::navigation::RootMessage::Keyboard;
 use crate::navigation::{AppSettings, RootMessage, ScreenState};
-use chrono::NaiveDate;
-use hashbrown::HashMap;
 use iced::{Subscription, keyboard, window};
 use iced_core::window::Position;
 #[cfg(target_os = "linux")]
 use iced_core::window::settings::PlatformSpecific;
 use iced_core::{Font, Size, Theme};
 use log::info;
+use parking_lot::{Mutex, RwLock};
 use rusqlite::Connection;
+use std::sync::Arc;
+use crate::data_provider::exam::{ExamEntryRepository, ExamRepository};
+
 pub const USER_FONT: Font = Font::with_name("Noto Sans JP");
 
 pub fn start() -> iced::Result {
@@ -57,13 +61,18 @@ fn subscription(_state: &ScreenState) -> Subscription<RootMessage> {
     keyboard::listen().map(Keyboard)
 }
 
+#[derive(Clone)]
 pub struct AppState {
-    pub dictionary: Vec<WordData>,
-    pub decks: Vec<DeckSettings>,
-    pub word_groups: Vec<WordGroup>,
-    pub connection: Connection,
-    pub sync_data: AppSettings,
-    pub activity: HashMap<Id, Vec<(NaiveDate, u32)>>,
+    pub dictionary: WordRepository,
+    pub decks: DeckRepository,
+    pub word_groups: WordGroupRepository,
+    pub card_states: CardStateRepository,
+    pub custom_fields: CustomFieldRepository,
+    pub connection: Arc<Mutex<SqliteConnection>>,
+    pub sync_data: Arc<RwLock<AppSettings>>,
+    pub history: HistoryRepository,
+    pub exam: ExamRepository,
+    pub exam_entries: ExamEntryRepository
 }
 
 impl Default for AppState {
@@ -74,30 +83,39 @@ impl Default for AppState {
 
 impl AppState {
     pub fn new() -> Self {
+        let connection = Arc::new(Mutex::new(SqliteConnection::default()));
         Self {
-            dictionary: vec![],
-            decks: vec![],
-            word_groups: vec![],
-            connection: default_connection(),
-            sync_data: AppSettings {
+            dictionary: WordRepository::new(connection.clone()),
+            decks: DeckRepository::new(connection.clone()),
+            word_groups: WordGroupRepository::new(connection.clone()),
+            card_states: CardStateRepository::new(connection.clone()),
+            history: HistoryRepository::new(connection.clone()),
+            exam: ExamRepository::new(connection.clone()),
+            custom_fields: CustomFieldRepository::new(connection.clone()),
+            exam_entries: ExamEntryRepository::new(connection.clone()),
+            sync_data: Arc::new(RwLock::new(AppSettings {
                 key: None,
                 auto_web_fetch: false,
-            },
-            activity: Default::default(),
+            })),
+            connection,
         }
     }
 }
 
 pub fn fill_state(state: &mut AppState) {
-    let list = load_words(&state.connection);
-    let sets = load_sets(&state.connection);
-    let groups = load_word_groups(&state.connection);
-    let setting = load_settings(&state.connection);
+    let connection = state.connection.lock();
 
-    state.dictionary = list.unwrap_or_default();
-    state.decks = sets.unwrap_or_default();
-    state.word_groups = groups.unwrap_or_default();
-    state.sync_data = setting
+    let setting = load_settings(&connection);
+    drop(connection);
+    state.word_groups.write().start().unwrap();
+    state.dictionary.write().start().unwrap();
+    state.decks.write().start().unwrap();
+    state.history.write().start().unwrap();
+    state.card_states.write().start().unwrap();
+    state.custom_fields.write().start().unwrap();
+    state.exam.write().start().unwrap();
+    state.exam_entries.write().start().unwrap();
+    state.sync_data = Arc::new(RwLock::new(setting))
 }
 
 fn load_settings(connection: &Connection) -> AppSettings {

src/core/deck.rs

@@ -1,121 +1,206 @@
 use crate::app::AppState;
+use crate::core::srs::OrderModule::{Fsrs, RandomSRS, SemiRandomSRS, WorstWordsSRS};
 use crate::core::srs::{
-    OrderMode, OrderModule, RandomSRSModule, SRSModule, SemiRandomSRSModule, WordOpenMode,
-    WorstWordsSRSModule,
+    FsrsModule, OrderMode, OrderModule, RandomSRSModule, SRSModule, SemiRandomSRSModule,
+    WordOpenMode, WorstWordsSRSModule,
 };
+use crate::data::Id;
 use crate::data::entities::*;
-use crate::data_provider::card_stats::{load_stats_of_deck, update_stat_score};
-use crate::data_provider::history::push_note;
-use crate::notification::{MaybeError, NotificationData};
+use crate::data::repositories::Repository;
+use crate::data_provider::card_states::CardStateRepositoryInner;
+use crate::notification::MaybeError;
 use chrono::Utc;
-use parking_lot::Mutex;
+use litemap::LiteMap;
+use log::info;
+use rhai::{Engine, Scope};
+use std::collections::HashMap;
 use std::sync::Arc;
+use std::time::Instant;
 
 #[derive(Clone)]
 pub struct DeckData {
-    pub(crate) words: Vec<WordData>,
-    pub(crate) set: Vec<CardStatistics>,
+    pub(crate) words: Vec<EntityHandle<WordData>>,
+    pub(crate) states: Vec<EntityHandle<CardState>>,
     current_word_index: Option<usize>,
-    state: Arc<Mutex<AppState>>,
+    state: AppState,
     order_module: OrderModule,
+    open_mode: OrderMode,
     settings: DeckSettings,
 }
+
+struct DisplayStyle {
+    properties: LiteMap<String, String>,
+}
+
 impl DeckData {
-    pub fn new(
-        settings: &DeckSettings,
-        state: Arc<Mutex<AppState>>,
-    ) -> Result<Self, NotificationData> {
-        let state_for = state.clone();
-        let state_locked = state.lock();
-
-        let stats = load_stats_of_deck(settings, &state_locked.connection)?;
-        let words = stats
-            .iter()
-            .map(|stat| {
-                state_locked
-                    .dictionary
-                    .binary_search_by_key(&stat.word_id, |w| w.id)
-                    .expect("No word found in dictionary")
-            })
-            .map(|index| &state_locked.dictionary[index])
-            .cloned()
+    pub fn new(settings: &DeckSettings, open_mode: OrderMode, state: AppState) -> Self {
+        let states_repo = state.card_states.read();
+        let mut query = states_repo.deck_states(settings.id);
+        let words = query
+            .iter(&states_repo)
+            .map(|card_state| EntityHandle::from_id(card_state.word_id))
             .collect();
-
-        Ok(Self {
-            set: stats,
+        let states = query.handles().collect::<Vec<EntityHandle<CardState>>>();
+        let fsrs = Fsrs(FsrsModule::new(
+            Self::set_links(states.as_slice(), &states_repo).as_slice(),
+        ));
+        drop(states_repo);
+        Self {
+            states,
             words,
             current_word_index: None,
-            state: state_for,
-            order_module: match settings.open_mode {
-                OrderMode::Default => OrderModule::SemiRandomSRS(SemiRandomSRSModule::new()),
-                OrderMode::TrainWorstFirst => {
-                    OrderModule::WorstWordsSRS(WorstWordsSRSModule::new())
-                }
-                OrderMode::FullRandom => OrderModule::RandomSRS(RandomSRSModule::new()),
-            },
+            state,
+            order_module: fsrs,
+            open_mode,
             settings: settings.clone(),
-        })
+        }
     }
 
-    pub fn next(&mut self) -> (WordData, CardStatistics) {
+    pub fn next(&mut self) -> (EntityHandle<WordData>, EntityHandle<CardState>) {
+        if self.fsrs_finished() {
+            self.switch_order_engine()
+        }
+        let repo = self.state.card_states.read();
+        let links = Self::set_links(self.states.as_slice(), &repo);
         let index = match self.order_module {
-            OrderModule::SemiRandomSRS(ref mut module) => {
-                if !module.initialized {
-                    module.init(self.set.as_slice())
-                }
-                module.next(self.set.as_slice())
-            }
-            OrderModule::RandomSRS(ref mut module) => {
-                if !module.initialized {
-                    module.init(self.set.as_slice())
-                }
-                module.next(self.set.as_slice())
-            }
-            OrderModule::WorstWordsSRS(ref mut module) => {
-                if !module.initialized {
-                    module.init(self.set.as_slice())
-                }
-                module.next(self.set.as_slice())
-            }
+            SemiRandomSRS(ref mut module) => module.next(links.as_slice()),
+
+            RandomSRS(ref mut module) => module.next(links.as_slice()),
+            WorstWordsSRS(ref mut module) => module.next(links.as_slice()),
+            Fsrs(ref mut module) => module.next(links.as_slice()),
         };
 
         self.current_word_index = Some(index);
-        (self.words[index].clone(), self.set[index].clone())
+        (self.words[index], self.states[index])
     }
+
+    fn set_links<'a>(
+        set: &[EntityHandle<CardState>],
+        repo: &'a CardStateRepositoryInner,
+    ) -> Vec<&'a CardState> {
+        set.iter()
+            .map(|h| repo.get_ref_static(*h).unwrap())
+            .collect::<Vec<_>>()
+    }
+
     pub fn open(&mut self, status: WordOpenMode) -> MaybeError {
         if let Some(index) = self.current_word_index {
-            let word: &mut CardStatistics = &mut self.set[index];
-            let old_score = word.score;
-            word.update(status);
-            let new_score = word.score;
+            let mut repo = self.state.card_states.write();
+            let card_state_handle = &mut self.states[index];
+            let card_state = repo.get_mut(card_state_handle).unwrap();
+            let old_score = card_state.score;
+            card_state.update(status);
+            let new_score = card_state.score;
 
+            let mut fsrs = false;
             match self.order_module {
-                OrderModule::SemiRandomSRS(ref mut module) => {
-                    module.open(status, index, word);
+                SemiRandomSRS(ref mut module) => {
+                    module.open(status, index, card_state);
                 }
-                OrderModule::RandomSRS(ref mut module) => {
-                    module.open(status, index, word);
+                RandomSRS(ref mut module) => {
+                    module.open(status, index, card_state);
                 }
-                OrderModule::WorstWordsSRS(ref mut module) => {
-                    module.open(status, index, word);
+                WorstWordsSRS(ref mut module) => {
+                    module.open(status, index, card_state);
+                }
+                Fsrs(ref mut module) => {
+                    module.open(status, index, card_state);
+                    fsrs = true;
                 }
             }
-            update_stat_score(word, &self.state.lock().connection)?;
-            let _ = push_note(
-                self.settings.id,
-                HistoryItem {
+
+            let word_id = card_state.word_id;
+            repo.save(card_state_handle)?;
+
+            let mut history = self.state.history.write();
+            history.create_now(HistoryNote {
+                id: Default::default(),
                 timestamp: Utc::now(),
-                    word_id: word.word_id,
-                    mode: status,
+                deck_id: self.settings.id,
+                word_id,
+                answer: status,
                 before: old_score,
                 after: new_score,
-                },
-            );
+                fsrs,
+            })?;
         }
 
         Ok(())
     }
+
+    fn switch_order_engine(&mut self) {
+        let repo = self.state.card_states.read();
+        let links = Self::set_links(self.states.as_slice(), &repo);
+        self.order_module = match self.open_mode {
+            OrderMode::Default => SemiRandomSRS(SemiRandomSRSModule::new(links.as_slice())),
+            OrderMode::TrainWorstFirst => WorstWordsSRS(WorstWordsSRSModule::new(links.as_slice())),
+            OrderMode::FullRandom => RandomSRS(RandomSRSModule::new(links.as_slice())),
+        }
+    }
+
+    fn fsrs_finished(&self) -> bool {
+        if let Fsrs(ref fsrs) = self.order_module
+            && fsrs.finished()
+        {
+            info!("Fsrs finished. Infinite mode enabled");
+            return true;
+        }
+
+        false
+    }
+
     pub fn len(&self) -> usize {
-        self.set.len()
+        self.states.len()
+    }
+
+    pub fn list(deck: &DeckSettings, state: &AppState) -> Vec<EntityHandle<WordData>> {
+        let time = Instant::now();
+        let list = vec![];
+        let engine = Engine::new();
+
+        let ast = engine.compile(&deck.filter);
+        if let Ok(ast) = ast {
+            let groups = state.word_groups.read().iter().cloned().collect::<Vec<_>>();
+            let dictionary = &state.dictionary.read();
+            let fields: HashMap<Id, String> = HashMap::from_iter(
+                state
+                    .custom_fields
+                    .read()
+                    .iter()
+                    .map(|f| (f.id, f.identifier.clone())),
+            );
+            let query = dictionary.query_par(Arc::new(move |word| {
+                let mut more = rhai::Map::new();
+                for kv in &word.additional {
+                    more.insert(fields[kv.0].clone().into(), kv.1.clone().into());
+                }
+                let mut scope = Scope::new();
+                let group_name = groups[groups
+                    .binary_search_by_key(&word.group_id, |g| g.id)
+                    .unwrap()]
+                .name
+                .clone();
+                scope
+                    .push_constant("id", word.id.0 as i64)
+                    .push_constant("key", word.key.clone())
+                    .push_constant("value", word.value.clone())
+                    .push_constant("tags", word.tags.clone())
+                    .push_constant("more", more)
+                    .push_constant("group", group_name);
+
+                let result = engine.eval_ast_with_scope::<bool>(&mut scope, &ast);
+                if let Ok(result) = result {
+                    return result;
+                }
+                false
+            }));
+
+            info!("Collecting available words is {:?}", time.elapsed());
+            let handles = query.handles().collect();
+            drop(query);
+            handles
+        } else {
+            list
+        }
     }
 }

src/core/srs.rs

@@ -1,14 +1,16 @@
-use crate::data::entities::CardStatistics;
+use crate::data::entities::CardState;
+use chrono::{Local, TimeDelta};
+use fsrs::FSRS;
 use rand::distr::weighted::WeightedIndex;
 use rand::prelude::ThreadRng;
 use rand::prelude::{Distribution, SliceRandom};
-use rand::rng;
+use rand::{RngExt, rng};
 
 const MAX_HISTORY_LEN: usize = 20;
 const MAX_HISTORY_LEN_PART: f32 = 0.33;
 pub const MAX_SCORE: u8 = 25;
 pub const FADE_PER_DAY: f32 = 0.95;
-
+const PARTIAL_POOL_SIZE: usize = 10;
 #[derive(Clone, PartialEq, Copy, Eq)]
 pub enum OrderMode {
     Default,
@@ -26,27 +28,25 @@ pub enum OrderModule {
     SemiRandomSRS(SemiRandomSRSModule),
     RandomSRS(RandomSRSModule),
     WorstWordsSRS(WorstWordsSRSModule),
+    Fsrs(FsrsModule),
 }
 pub trait SRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize;
-    fn open(&mut self, status: WordOpenMode, index: usize, updated_word: &CardStatistics);
-    fn init(&mut self, set: &[CardStatistics]);
+    fn new(set: &[&CardState]) -> Self;
+    fn next(&mut self, set: &[&CardState]) -> usize;
+    fn open(&mut self, status: WordOpenMode, index: usize, updated_word: &mut CardState);
 }
 #[derive(Clone)]
 pub struct RandomSRSModule {
     basket: Vec<usize>,
-    pub(crate) initialized: bool,
-}
-impl RandomSRSModule {
-    pub(crate) fn new() -> RandomSRSModule {
-        Self {
-            basket: vec![],
-            initialized: false,
-        }
-    }
 }
 impl SRSModule for RandomSRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize {
+    fn new(set: &[&CardState]) -> Self {
+        let mut basket = (0..set.len()).collect::<Vec<usize>>();
+        basket.shuffle(&mut rand::rng());
+        Self { basket }
+    }
+
+    fn next(&mut self, set: &[&CardState]) -> usize {
         match self.basket.pop() {
             Some(index) => index,
             None => {
@@ -57,33 +57,28 @@ impl SRSModule for RandomSRSModule {
         }
     }
 
-    fn open(&mut self, _: WordOpenMode, _: usize, _: &CardStatistics) {}
-
-    fn init(&mut self, set: &[CardStatistics]) {
-        self.initialized = true;
-        self.basket = (0..set.len()).collect::<Vec<usize>>();
-        self.basket.shuffle(&mut rand::rng())
-    }
+    fn open(&mut self, _: WordOpenMode, _: usize, _: &mut CardState) {}
 }
 #[derive(Clone)]
 pub struct SemiRandomSRSModule {
     history: Vec<usize>,
     last_weights: WeightedIndex<f32>,
     generator: ThreadRng,
-    pub(crate) initialized: bool,
-}
-impl SemiRandomSRSModule {
-    pub(crate) fn new() -> SemiRandomSRSModule {
-        SemiRandomSRSModule {
-            history: vec![],
-            last_weights: WeightedIndex::new([1.0]).unwrap(),
-            generator: rng(),
-            initialized: false,
-        }
-    }
 }
 impl SRSModule for SemiRandomSRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize {
+    fn new(set: &[&CardState]) -> Self {
+        let weights = set
+            .iter()
+            .map(|s| (100.0 / s.calculated_score()).powf(2.0) * 2.0)
+            .collect::<Vec<f32>>();
+
+        Self {
+            generator: rng(),
+            last_weights: WeightedIndex::new(weights).expect("Incorrect weights update"),
+            history: vec![],
+        }
+    }
+    fn next(&mut self, set: &[&CardState]) -> usize {
         let index = self.last_weights.sample(&mut self.generator);
 
         if self.history.contains(&index) && self.history.len() != 1 {
@@ -97,29 +92,20 @@ impl SRSModule for SemiRandomSRSModule {
 
         index
     }
-    fn open(&mut self, _: WordOpenMode, index: usize, word: &CardStatistics) {
+    fn open(&mut self, _: WordOpenMode, index: usize, word: &mut CardState) {
         let new_weight = (100.0 / word.calculated_score()).powf(2.0);
         self.last_weights
             .update_weights(&[(index, &new_weight)])
             .expect("update weights error");
     }
-    fn init(&mut self, set: &[CardStatistics]) {
-        self.initialized = true;
-        let weights = set
-            .iter()
-            .map(|s| (100.0 / s.calculated_score()).powf(2.0) * 2.0)
-            .collect::<Vec<f32>>();
-        self.last_weights = WeightedIndex::new(weights).expect("Incorrect weights update");
-    }
 }
 impl SemiRandomSRSModule {
-    fn history_len(&self, set: &[CardStatistics]) -> usize {
+    fn history_len(&self, set: &[&CardState]) -> usize {
         ((set.len() as f32 * MAX_HISTORY_LEN_PART) as usize).clamp(1, MAX_HISTORY_LEN)
     }
 }
 #[derive(Clone)]
 pub struct WorstWordsSRSModule {
-    pub(crate) initialized: bool,
     pool_size: usize,
     rounds_remaining: u8,
     pool: Vec<usize>,
@@ -127,7 +113,17 @@ pub struct WorstWordsSRSModule {
     rounds_count: u8,
 }
 impl SRSModule for WorstWordsSRSModule {
-    fn next(&mut self, set: &[CardStatistics]) -> usize {
+    fn new(_: &[&CardState]) -> Self {
+        WorstWordsSRSModule {
+            pool_size: PARTIAL_POOL_SIZE,
+            rounds_count: 2,
+            rounds_remaining: 0,
+            pool: vec![],
+            queue: vec![],
+        }
+    }
+
+    fn next(&mut self, set: &[&CardState]) -> usize {
         if self.rounds_remaining == 0 {
             self.fill_pool(set);
             self.rounds_remaining = self.rounds_count;
@@ -143,24 +139,10 @@ impl SRSModule for WorstWordsSRSModule {
         }
     }
 
-    fn open(&mut self, _: WordOpenMode, _: usize, _: &CardStatistics) {}
-
-    fn init(&mut self, _: &[CardStatistics]) {
-        self.initialized = true;
-    }
+    fn open(&mut self, _: WordOpenMode, _: usize, _: &mut CardState) {}
 }
 impl WorstWordsSRSModule {
-    pub(crate) fn new() -> WorstWordsSRSModule {
-        WorstWordsSRSModule {
-            initialized: false,
-            pool_size: 15,
-            rounds_count: 2,
-            rounds_remaining: 0,
-            pool: vec![],
-            queue: vec![],
-        }
-    }
-    fn fill_pool(&mut self, set: &[CardStatistics]) {
+    fn fill_pool(&mut self, set: &[&CardState]) {
         let mut sorted = set.iter().enumerate().collect::<Vec<_>>();
         sorted.sort_by_key(|c| c.1.score);
         let mut worst = sorted[0..self.pool_size]
@@ -172,7 +154,91 @@ impl WorstWordsSRSModule {
     }
 }
 
-#[derive(Clone, Copy)]
+#[derive(Clone)]
+pub struct FsrsModule {
+    next_round: Vec<usize>,
+    queue: Vec<usize>,
+    rng: ThreadRng,
+    fsrs: FSRS,
+}
+
+impl SRSModule for FsrsModule {
+    fn new(set: &[&CardState]) -> Self {
+        let today = Local::now().date_naive();
+
+        let mut new = Self {
+            queue: set
+                .iter()
+                .enumerate()
+                .filter(|(_, c)| c.fsrs_open_day <= today)
+                .map(|(index, _)| index)
+                .collect(),
+            next_round: vec![],
+            rng: rng(),
+            fsrs: FSRS::default(),
+        };
+        new.queue.shuffle(&mut new.rng);
+
+        new
+    }
+
+    fn next(&mut self, _: &[&CardState]) -> usize {
+        if self.queue.is_empty() {
+            self.fill_queue();
+            self.queue.shuffle(&mut self.rng);
+        }
+
+        self.queue.pop().unwrap_or(0)
+    }
+
+    fn open(&mut self, status: WordOpenMode, index: usize, updated_word: &mut CardState) {
+        let today = Local::now().date_naive();
+        let delta = today - updated_word.fsrs_opened;
+        let delta_days = delta.num_days();
+
+        let memory = self
+            .fsrs
+            .next_states(updated_word.fsrs_memory, 0.9, delta_days as u32)
+            .expect("Wrong next stage calculation");
+
+        let next = match status {
+            WordOpenMode::Easy => memory.easy,
+            WordOpenMode::Ok => memory.good,
+            WordOpenMode::Hard => memory.hard,
+            WordOpenMode::None => memory.again,
+        };
+
+        let mut next_day = today + TimeDelta::days(next.interval.round() as i64);
+        if (next_day - today).num_days() >= 5 {
+            let offset = ((rng().random::<f32>() - 0.5) * 3.0).round() as i32;
+            next_day += TimeDelta::days(offset as i64);
+        }
+
+        let first_time = updated_word.fsrs_memory.is_none();
+
+        updated_word.fsrs_memory = Some(next.memory);
+        updated_word.fsrs_open_day = next_day;
+        updated_word.fsrs_opened = updated_word.last_open.date_naive();
+
+        if (updated_word.fsrs_open_day == today && !first_time)
+            || (first_time && status != WordOpenMode::Easy)
+        {
+            self.next_round.push(index);
+        }
+    }
+}
+
+impl FsrsModule {
+    fn fill_queue(&mut self) {
+        self.queue.append(&mut self.next_round);
+    }
+
+    pub fn finished(&self) -> bool {
+        self.queue.is_empty() && self.next_round.is_empty()
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq)]
 pub enum WordOpenMode {
     Easy,
     Ok,

src/data.rs

@@ -1,4 +1,5 @@
 pub mod entities;
+pub mod repositories;
 
 use rusqlite::ToSql;
 use rusqlite::types::{FromSql, FromSqlError, FromSqlResult, ToSqlOutput, ValueRef};
@@ -6,57 +7,76 @@ use std::fmt::{Display, Formatter};
 use std::num::ParseIntError;
 use std::str::FromStr;
 
+macro_rules! id_impl {
+    ($id_type:ty, $name:ident, $invalid:ident) => {
         #[derive(Clone, PartialEq, Eq, Debug, Hash, Copy, Ord, PartialOrd, Default)]
-pub struct Id(pub(crate) u32);
-pub const INVALID_ID: Id = Id(0);
-impl FromStr for Id {
+        pub struct $name(pub(crate) $id_type);
+        pub const $invalid: $name = $name(0);
+        impl FromStr for $name {
             type Err = ParseIntError;
 
             fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(Id(s.parse::<u32>()?))
+                Ok($name(s.parse::<$id_type>()?))
             }
         }
 
-impl From<u32> for Id {
-    fn from(value: u32) -> Self {
-        Id(value)
+        impl From<$id_type> for $name {
+            fn from(value: $id_type) -> Self {
+                $name(value)
             }
         }
 
-impl From<Id> for u32 {
-    fn from(value: Id) -> Self {
+        impl From<$name> for $id_type {
+            fn from(value: $name) -> Self {
                 value.0
             }
         }
-impl Display for Id {
+        impl Display for $name {
             fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
                 write!(f, "{}", self.0)
             }
         }
 
-impl FromSql for Id {
+        impl FromSql for $name {
             fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
                 match value {
-            ValueRef::Integer(i) => Ok(Id(i as u32)),
+                    ValueRef::Integer(i) => Ok($name(i as $id_type)),
                     _ => Err(FromSqlError::InvalidType),
                 }
             }
         }
 
-impl ToSql for Id {
+        impl ToSql for $name {
             fn to_sql(&self) -> rusqlite::Result<ToSqlOutput<'_>> {
                 Ok(ToSqlOutput::from(self.0 as i64))
             }
         }
 
-impl From<Id> for String {
-    fn from(value: Id) -> Self {
+        impl From<$name> for String {
+            fn from(value: $name) -> Self {
                 value.0.to_string()
             }
         }
 
-impl Id {
+        impl $name {
             pub(crate) fn is_valid(self) -> bool {
                 self.0 != 0
             }
         }
+    };
+}
+
+id_impl!(u32, Id, INVALID_ID);
+id_impl!(u16, SmallId, INVALID_SMALL_ID);
+
+impl From<SmallId> for Id {
+    fn from(value: SmallId) -> Self {
+        Self(value.0 as u32)
+    }
+}
+
+impl From<Id> for SmallId {
+    fn from(value: Id) -> Self {
+        Self(value.0 as u16)
+    }
+}

src/data/entities.rs

@@ -1,28 +1,53 @@
-use crate::app::AppState;
-use crate::core::srs::{FADE_PER_DAY, MAX_SCORE, OrderMode, WordOpenMode};
+use crate::core::srs::{FADE_PER_DAY, MAX_SCORE, WordOpenMode};
 use crate::data::{INVALID_ID, Id};
-use chrono::{DateTime, Utc};
+use crate::data_provider::history::HistoryRepositoryInner;
+use chrono::{DateTime, Local, NaiveDate, Utc};
+use fsrs::MemoryState;
+use litemap::LiteMap;
 use log::info;
-use rayon::prelude::*;
-use rhai::{Engine, Scope};
-use std::collections::HashMap;
+use rhai::Engine;
+use std::cmp::Ordering;
+use std::hash::{Hash, Hasher};
+use std::marker::PhantomData;
+use std::sync::Arc;
 use std::time::Instant;
 
 #[derive(Clone, Debug)]
 pub struct WordData {
     pub id: Id,
+    pub group_id: Id,
     pub key: String,
     pub value: String,
     pub tags: String,
-    pub additional: HashMap<String, String>,
-    pub group_id: Id,
+    pub additional: LiteMap<Id, String>,
 }
+
+impl EntityData for WordData {
+    fn id(&self) -> Id {
+        self.id
+    }
+
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
 #[derive(Clone)]
 pub struct WordGroup {
     pub id: Id,
     pub name: String,
 }
 
+impl EntityData for WordGroup {
+    fn id(&self) -> Id {
+        self.id
+    }
+
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
 impl WordData {
     pub fn new() -> Self {
         Self {
@@ -37,12 +62,51 @@ impl WordData {
 }
 
 #[derive(Clone)]
-pub struct HistoryItem {
+pub struct HistoryNote {
+    pub id: Id,
     pub timestamp: DateTime<Utc>,
+    pub deck_id: Id,
     pub word_id: Id,
-    pub mode: WordOpenMode,
+    pub answer: WordOpenMode,
     pub before: u8,
     pub after: u8,
+    pub fsrs: bool,
+}
+
+impl EntityData for HistoryNote {
+    fn id(&self) -> Id {
+        self.id
+    }
+
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
+impl HistoryRepositoryInner {
+    pub fn activity_of_deck(&self, id: Id) -> Vec<(NaiveDate, u32)> {
+        let mut query = self.query(Arc::new(move |note| note.deck_id == id));
+        let values = query.iter(self).collect::<Vec<_>>();
+        let mut counts = vec![];
+        if !values.is_empty() {
+            let mut date = values[0].timestamp.with_timezone(&Local).date_naive();
+            let mut count = 0;
+            for note in values {
+                let current_date = note.timestamp.with_timezone(&Local).date_naive();
+                if date == current_date {
+                    count += 1;
+                } else {
+                    counts.push((date, count));
+                    date = current_date;
+                    count = 0;
+                }
+            }
+            if count != 0 {
+                counts.push((date, count));
+            }
+        }
+        counts
+    }
 }
 
 #[derive(Clone)]
@@ -52,19 +116,26 @@ pub struct DeckSettings {
     pub forward: String,
     pub backward: String,
     pub filter: String,
-    pub count: Option<usize>,
-    pub open_mode: OrderMode,
 }
+
+impl EntityData for DeckSettings {
+    fn id(&self) -> Id {
+        self.id
+    }
+
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
 impl DeckSettings {
     pub(crate) fn with_name(name: String) -> DeckSettings {
         DeckSettings {
             id: 0.into(),
             name,
-            forward: "".to_string(),
-            backward: "".to_string(),
+            forward: String::new(),
+            backward: String::new(),
             filter: "true".to_string(),
-            count: None,
-            open_mode: OrderMode::Default,
         }
     }
     pub fn check_filter(&self) -> bool {
@@ -74,71 +145,34 @@ impl DeckSettings {
         info!("Compile time is {:?}", time.elapsed());
         ast.is_ok()
     }
-    pub fn get_word_list(&self, state: &AppState) -> Vec<usize> {
-        let time = Instant::now();
-        let mut list = vec![];
-        let engine = Engine::new();
-
-        let ast = engine.compile(&self.filter);
-        if let Ok(ast) = ast {
-            let groups = &state.word_groups;
-
-            list = state
-                .dictionary
-                .par_iter()
-                .enumerate()
-                .filter(|(_, word)| {
-                    let mut more = rhai::Map::new();
-                    for iced in &word.additional {
-                        more.insert(iced.0.clone().into(), iced.1.clone().into());
-                    }
-                    let mut scope = Scope::new();
-                    scope
-                        .push_constant("id", word.id.0 as i64)
-                        .push_constant("key", word.key.clone())
-                        .push_constant("value", word.value.clone())
-                        .push_constant("tags", word.tags.clone())
-                        .push_constant("more", more)
-                        .push_constant(
-                            "group",
-                            groups
-                                .iter()
-                                .find(|g| g.id == word.group_id)
-                                .cloned()
-                                .expect("No group id")
-                                .name,
-                        );
-
-                    let result = engine.eval_ast_with_scope::<bool>(&mut scope, &ast);
-                    if let Ok(result) = result {
-                        return result;
-                    }
-                    false
-                })
-                .map(|(index, _)| index)
-                .collect();
-
-            info!("Collecting available words is {:?}", time.elapsed());
-
-            list
-        } else {
-            list
-        }
-    }
     pub fn require_speech(&self) -> bool {
-        self.forward == "speech" || self.backward == "speech"
+        self.forward.contains("speech") || self.backward.contains("speech")
     }
 }
 
 #[derive(Clone, PartialEq)]
-pub struct CardStatistics {
+pub struct CardState {
     pub id: Id,
     pub word_id: Id,
-    pub set_id: Id,
+    pub deck_id: Id,
     pub last_open: DateTime<Utc>,
     pub score: u8,
+    pub fsrs_opened: NaiveDate,
+    pub fsrs_memory: Option<MemoryState>,
+    pub fsrs_open_day: NaiveDate,
 }
-impl CardStatistics {
+
+impl EntityData for CardState {
+    fn id(&self) -> Id {
+        self.id
+    }
+
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
+impl CardState {
     pub fn update(&mut self, status: WordOpenMode) {
         match status {
             WordOpenMode::Easy => {
@@ -164,3 +198,135 @@ impl CardStatistics {
         (self.score as f32 * multiplier).max(1.0)
     }
 }
+
+#[derive(Clone)]
+pub struct CustomField {
+    pub id: Id,
+    pub name: String,
+    pub identifier: String,
+}
+
+impl EntityData for CustomField {
+    fn id(&self) -> Id {
+        self.id
+    }
+
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
+#[derive(Clone)]
+pub struct Exam {
+    pub id: Id,
+    pub timestamp: DateTime<Utc>,
+    pub deck_id: Id,
+}
+
+impl EntityData for Exam {
+    fn id(&self) -> Id {
+        self.id
+    }
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
+#[derive(Clone)]
+pub struct ExamEntry{
+    pub id: Id,
+    pub exam_id: Id,
+    pub word_id: Id,
+    pub status: Option<bool>
+}
+
+impl EntityData for ExamEntry {
+    fn id(&self) -> Id {
+        self.id
+    }
+    
+    fn set_id(&mut self, id: Id) {
+        self.id = id;
+    }
+}
+
+pub struct EntityHandle<E> {
+    pub(crate) id: Id,
+    index: u32,
+    pub(crate) _phantom: PhantomData<E>,
+}
+
+impl<T> Clone for EntityHandle<T> {
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<T> Copy for EntityHandle<T> {}
+impl<T> EntityHandle<T> {
+    pub fn new(id: Id, index: usize, real: bool) -> Self {
+        Self {
+            id,
+            index: ((index as u32) << 1 >> 1) | (!real as u32) << 31,
+            _phantom: Default::default(),
+        }
+    }
+
+    pub fn from_id(id: Id) -> Self {
+        Self::new(id, id.0 as usize, true)
+    }
+
+    pub fn index(&self) -> usize {
+        (self.index << 1 >> 1) as usize
+    }
+
+    pub fn set_index(&mut self, index: usize) {
+        self.index = (self.index >> 31 << 31) | ((index as u32) << 1 >> 1);
+    }
+
+    pub fn real(&self) -> bool {
+        (self.index >> 31) == 0
+    }
+
+    pub fn set_real(&mut self, value: bool) {
+        self.index = self.index << 1 >> 1 | (!value as u32) << 31;
+    }
+}
+impl<T> Eq for EntityHandle<T> {}
+
+impl<T> PartialEq<Self> for EntityHandle<T> {
+    fn eq(&self, other: &Self) -> bool {
+        self.real() == other.real() && self.id == other.id
+    }
+}
+impl<T> PartialOrd<Self> for EntityHandle<T> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl<T> Ord for EntityHandle<T> {
+    fn cmp(&self, other: &Self) -> Ordering {
+        if self.real() && !other.real() {
+            return Ordering::Less;
+        }
+
+        if !self.real() && other.real() {
+            return Ordering::Greater;
+        }
+
+        self.id.cmp(&other.id)
+    }
+}
+
+impl<T> Hash for EntityHandle<T> {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.id.hash(state);
+        self.real().hash(state);
+    }
+}
+
+pub trait EntityData {
+    fn id(&self) -> Id;
+    fn set_id(&mut self, id: Id);
+}

src/data/repositories.rs

@@ -0,0 +1,732 @@
+use crate::data::Id;
+use crate::data::entities::{EntityData, EntityHandle};
+use crate::data_provider::sqlite::SqliteConnection;
+use crate::helpers::into_result;
+use crate::notification::{MaybeError, NotificationData};
+use log::debug;
+use parking_lot::{Mutex, RwLock};
+use rayon::iter::IndexedParallelIterator;
+use rayon::iter::IntoParallelRefIterator;
+use rayon::iter::ParallelIterator;
+use rusqlite::Connection;
+use std::marker::PhantomData;
+use std::ops::{Deref, Index, IndexMut};
+use std::sync::Arc;
+use std::time::Instant;
+
+pub trait Repository<T, D>
+where
+    D: DbLayer<T>,
+{
+    fn get(&self, handle: &mut EntityHandle<T>) -> Option<T>;
+    fn get_ref(&self, handle: &mut EntityHandle<T>) -> Option<&T>;
+    fn get_mut(&mut self, handle: &mut EntityHandle<T>) -> Option<&mut T>;
+    fn get_static(&self, handle: EntityHandle<T>) -> Option<T>;
+    fn get_ref_static(&self, handle: EntityHandle<T>) -> Option<&T>;
+    fn get_mut_static(&mut self, handle: EntityHandle<T>) -> Option<&mut T>;
+    fn set(&mut self, handle: &mut EntityHandle<T>, value: T);
+    fn set_static(&mut self, handle: EntityHandle<T>, value: T);
+    fn handle_by_id(&self, id: Id) -> EntityHandle<T>;
+    fn create(&mut self, new: T) -> EntityHandle<T>;
+    fn create_now(&mut self, new: T) -> Result<EntityHandle<T>, NotificationData>;
+    fn save(&mut self, entity: &mut EntityHandle<T>) -> MaybeError;
+    fn delete(&mut self, handle: EntityHandle<T>) -> MaybeError;
+    fn find<F>(&self, predicate: F) -> Option<EntityHandle<T>>
+    where
+        F: Fn(&T) -> bool;
+    fn init(&mut self) -> MaybeError;
+    fn start(&mut self) -> MaybeError;
+    fn reload(&mut self) -> MaybeError;
+    fn shifts(&self) -> usize;
+    fn iter<'a>(&'a self) -> impl Iterator<Item = &'a T>
+    where
+        T: 'a;
+    fn iter_mut<'a>(&'a mut self) -> impl Iterator<Item = &'a mut T>
+    where
+        T: 'a;
+}
+
+struct QueryManger<T, R, D>
+where
+    R: Repository<T, D>,
+    D: DbLayer<T>,
+{
+    queries: Vec<Arc<Mutex<Query<T, R, D>>>>,
+}
+
+impl<T, R, D> QueryManger<T, R, D>
+where
+    R: Repository<T, D>,
+    D: DbLayer<T>,
+    T: EntityData,
+{
+    pub(crate) fn handle_save(&self, old: EntityHandle<T>, new: &mut EntityHandle<T>, data: &T) {
+        return;
+        if old.real() && new.real() {
+            return;
+        }
+
+        let affected = self.get_affected_queries(data);
+        for q in affected {
+            let mut query = self.queries[q].lock();
+            let index = query.cache.binary_search(&old).unwrap();
+            query.cache.remove(index);
+            let real_end = query.cache.iter().rposition(|r| r.real()).unwrap() + 1;
+            query.cache.insert(real_end, new.clone());
+        }
+    }
+    pub(crate) fn handle_delete(&self, handle: &EntityHandle<T>, data: &T) {
+        return;
+        let affected = self.get_affected_queries(data);
+        for q in affected {
+            let mut query = self.queries[q].lock();
+            let slice = query.cache.as_slice();
+            if let Ok(index) = slice.binary_search(&handle) {
+                query.cache.remove(index);
+            }
+        }
+    }
+
+    fn get_affected_queries(&self, data: &T) -> Vec<usize> {
+        self.queries
+            .iter()
+            .enumerate()
+            .filter(|(_, q)| {
+                let query = q.lock();
+                let rule = &query.rule;
+                rule(data)
+            })
+            .map(|(i, _)| i)
+            .collect()
+    }
+
+    fn reload_queries(&mut self, data_repository: impl Repository<T, D>) {
+        for q in &self.queries {
+            let mut query = q.lock();
+            query.cache.clear();
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct Query<T, R, D>
+where
+    R: Repository<T, D>,
+    D: DbLayer<T>,
+{
+    cache: Vec<EntityHandle<T>>,
+    rule: Arc<dyn Fn(&T) -> bool + Send + Sync>,
+    parallel: bool,
+    _marker: PhantomData<(R, D)>,
+    shift_stamp: usize,
+}
+
+impl<T: EntityData + Clone + Send + Sync, R: Repository<T, D>, D: DbLayer<T>> Query<T, R, D> {
+    pub fn iter<'a>(
+        &mut self,
+        data_repository_inner: &'a DataRepositoryInner<T, D>,
+    ) -> impl Iterator<Item = &'a T>
+    where
+        T: 'a,
+    {
+        if self.shift_stamp != data_repository_inner.shifts() {
+            self.load(data_repository_inner);
+        }
+        self.cache
+            .iter_mut()
+            .filter_map(move |e| data_repository_inner.get_ref(e))
+    }
+
+    pub fn iter_with_handles<'a>(
+        &mut self,
+        data_repository_inner: &'a DataRepositoryInner<T, D>,
+    ) -> impl Iterator<Item = (&'a T, EntityHandle<T>)>
+    where
+        T: 'a,
+    {
+        if self.shift_stamp != data_repository_inner.shifts() {
+            self.load(data_repository_inner);
+        }
+        self.cache
+            .iter_mut()
+            .filter_map(move |e| Some((data_repository_inner.get_ref(e)?, *e)))
+    }
+
+    pub fn for_each_mut<F>(&mut self, repo: &mut DataRepositoryInner<T, D>, mut f: F)
+    where
+        F: FnMut(&mut T),
+    {
+        if self.shift_stamp != repo.shifts() {
+            self.load(repo);
+        }
+        for handle in &mut self.cache {
+            if let Some(entity) = repo.get_mut(handle) {
+                f(entity);
+            }
+        }
+    }
+
+    pub fn load(&mut self, data_repository: &DataRepositoryInner<T, D>)
+    where
+        T: Send + Sync,
+    {
+        let time = Instant::now();
+        self.cache.clear();
+        if self.parallel {
+            self.cache = data_repository
+                .cache
+                .par_iter()
+                .enumerate()
+                .filter(|(_, entity)| self.rule.as_ref()(entity))
+                .map(|(i, entity)| EntityHandle::new(entity.id(), i, true))
+                .collect();
+        } else {
+            self.cache = data_repository
+                .cache
+                .iter()
+                .enumerate()
+                .filter(|(_, entity)| (self.rule)(entity))
+                .map(|(i, entity)| EntityHandle::new(entity.id(), i, true))
+                .collect();
+        }
+
+        self.cache.extend(
+            data_repository
+                .temporal
+                .iter()
+                .enumerate()
+                .filter(|(_, entity)| (self.rule)(entity))
+                .map(|(i, entity)| EntityHandle::new(entity.id(), i, false))
+                .collect::<Vec<_>>(),
+        );
+
+        debug!(
+            "Query for {} elements (filtered {}) takes {:?}",
+            data_repository.len(),
+            self.cache.len(),
+            time.elapsed()
+        );
+    }
+
+    pub fn handles(&self) -> impl Iterator<Item = EntityHandle<T>> {
+        self.cache.iter().cloned()
+    }
+
+    pub fn len(&self) -> usize {
+        self.cache.len()
+    }
+
+    pub fn get(&self, index: usize) -> Option<EntityHandle<T>> {
+        self.cache.get(index).cloned()
+    }
+}
+
+impl<T: EntityData + Clone + Send + Sync, R: Repository<T, D>, D: DbLayer<T>> Index<usize>
+    for Query<T, R, D>
+{
+    type Output = EntityHandle<T>;
+
+    fn index(&self, index: usize) -> &Self::Output {
+        &self.cache[index]
+    }
+}
+
+impl<T: EntityData + Clone + Send + Sync, R: Repository<T, D>, D: DbLayer<T>> IndexMut<usize>
+    for Query<T, R, D>
+{
+    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
+        &mut self.cache[index]
+    }
+}
+
+pub trait BatchedRepository<T, D>
+where
+    D: BatchedDbLayer<T>,
+    T: EntityData,
+{
+    fn create_now_many(
+        &mut self,
+        entities: &mut [T],
+    ) -> Result<Vec<EntityHandle<T>>, NotificationData>;
+    fn save_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError;
+    fn delete_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError;
+}
+
+pub trait DbLayer<T> {
+    fn write_entity(&self, entity: &T, connection: &Connection) -> MaybeError;
+    fn add_entity(&mut self, entity: &mut T, connection: &Connection) -> MaybeError;
+    fn delete_entity(&mut self, id: Id, connection: &Connection) -> MaybeError;
+    fn load_all(&self, storage: &mut Vec<T>, connection: &Connection) -> MaybeError;
+}
+
+pub trait BatchedDbLayer<T>
+where
+    T: EntityData,
+{
+    fn delete_many_entities(&mut self, ids: &[Id], connection: &mut Connection) -> MaybeError;
+    fn add_many_entities(&mut self, entity: &mut [T], connection: &mut Connection) -> MaybeError;
+}
+
+#[derive(Clone)]
+pub struct DataRepository<T: Clone + EntityData, D: DbLayer<T>> {
+    inner: Arc<RwLock<DataRepositoryInner<T, D>>>,
+}
+
+pub struct DataRepositoryInner<T: Clone + EntityData, D: DbLayer<T>> {
+    cache: Vec<T>,
+    temporal: Vec<T>,
+    next_temporal: u32,
+    connection: Arc<Mutex<SqliteConnection>>,
+    data_layer: D,
+    query_manger: QueryManger<T, Self, D>,
+    version: u16,
+    shifts: usize,
+}
+
+impl<T: Clone + EntityData, D: DbLayer<T> + Default> DataRepository<T, D> {
+    pub fn new(connection: Arc<Mutex<SqliteConnection>>) -> DataRepository<T, D> {
+        Self {
+            inner: Arc::new(RwLock::new(DataRepositoryInner {
+                cache: vec![],
+                temporal: vec![],
+                next_temporal: 0,
+                connection,
+                data_layer: Default::default(),
+                query_manger: QueryManger { queries: vec![] },
+                version: 0,
+                shifts: 0,
+            })),
+        }
+    }
+}
+
+impl<T: Clone + EntityData, D: DbLayer<T>> Deref for DataRepository<T, D> {
+    type Target = Arc<RwLock<DataRepositoryInner<T, D>>>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
+impl<T: EntityData + Clone + std::marker::Send + std::marker::Sync, D: DbLayer<T>>
+    DataRepositoryInner<T, D>
+{
+    pub fn query_par(
+        &self,
+        rule: Arc<dyn Fn(&T) -> bool + Send + Sync>,
+    ) -> Query<T, DataRepositoryInner<T, D>, D>
+    where
+        T: Send + Sync,
+    {
+        let mut query = Query {
+            cache: vec![],
+            rule,
+            parallel: true,
+            _marker: PhantomData,
+            shift_stamp: self.shifts,
+        };
+
+        query.load(self);
+
+        query
+    }
+
+    pub fn query(
+        &self,
+        rule: Arc<dyn Fn(&T) -> bool + Send + Sync>,
+    ) -> Query<T, DataRepositoryInner<T, D>, D>
+    where
+        T: Send + Sync,
+    {
+        let mut query = Query {
+            cache: vec![],
+            rule,
+            parallel: false,
+            _marker: PhantomData,
+            shift_stamp: self.shifts,
+        };
+
+        query.load(self);
+
+        query
+    }
+
+    pub fn empty_query(&self) -> Query<T, DataRepositoryInner<T, D>, D> {
+        Query {
+            cache: vec![],
+            rule: Arc::new(|_| false),
+            parallel: false,
+            _marker: Default::default(),
+            shift_stamp: 0,
+        }
+    }
+
+    pub fn empty_query_par(&self) -> Query<T, DataRepositoryInner<T, D>, D> {
+        Query {
+            cache: vec![],
+            rule: Arc::new(|_| false),
+            parallel: true,
+            _marker: Default::default(),
+            shift_stamp: 0,
+        }
+    }
+
+    pub fn full_query(&self) -> Query<T, DataRepositoryInner<T, D>, D> {
+        self.query(Arc::new(|_| true))
+    }
+
+    pub fn len(&self) -> usize {
+        self.cache.len() + self.temporal.len()
+    }
+}
+
+impl<T: EntityData + Clone, D: DbLayer<T>> Repository<T, D> for DataRepositoryInner<T, D> {
+    fn get(&self, handle: &mut EntityHandle<T>) -> Option<T> {
+        let slice = if handle.real() {
+            self.cache.as_slice()
+        } else {
+            self.temporal.as_slice()
+        };
+        let index = fast_position_of(slice, handle)?;
+        Some(slice[index].clone())
+    }
+
+    fn get_ref(&self, handle: &mut EntityHandle<T>) -> Option<&T> {
+        let slice = if handle.real() {
+            self.cache.as_slice()
+        } else {
+            self.temporal.as_slice()
+        };
+        let index = fast_position_of(slice, handle)?;
+        Some(&slice[index])
+    }
+
+    fn get_mut(&mut self, handle: &mut EntityHandle<T>) -> Option<&mut T> {
+        let slice = if handle.real() {
+            self.cache.as_mut_slice()
+        } else {
+            self.temporal.as_mut_slice()
+        };
+        let index = fast_position_of(slice, handle)?;
+        Some(&mut slice[index])
+    }
+
+    fn get_static(&self, mut handle: EntityHandle<T>) -> Option<T> {
+        self.get(&mut handle)
+    }
+
+    fn get_ref_static(&self, mut handle: EntityHandle<T>) -> Option<&T> {
+        self.get_ref(&mut handle)
+    }
+
+    fn get_mut_static(&mut self, mut handle: EntityHandle<T>) -> Option<&mut T> {
+        self.get_mut(&mut handle)
+    }
+
+    fn set(&mut self, handle: &mut EntityHandle<T>, value: T) {
+        let slice = if handle.real() {
+            self.cache.as_mut_slice()
+        } else {
+            self.temporal.as_mut_slice()
+        };
+        let index = fast_position_of(slice, handle).unwrap();
+        slice[index] = value;
+    }
+
+    fn set_static(&mut self, mut handle: EntityHandle<T>, value: T) {
+        self.set(&mut handle, value)
+    }
+
+    fn handle_by_id(&self, id: Id) -> EntityHandle<T> {
+        EntityHandle::new(id, id.0 as usize, true)
+    }
+
+    fn create(&mut self, mut new: T) -> EntityHandle<T> {
+        let next_temporal = self.next_temporal;
+        self.next_temporal += 1;
+        let entity = EntityHandle::new(next_temporal.into(), self.temporal.len(), false);
+        new.set_id(entity.id);
+        self.temporal.push(new);
+        entity
+    }
+
+    fn create_now(&mut self, mut new: T) -> Result<EntityHandle<T>, NotificationData> {
+        self.data_layer
+            .add_entity(&mut new, &self.connection.lock())?;
+        let index = self.cache.len();
+        let handle = EntityHandle::new(new.id(), index, true);
+        self.cache.push(new);
+        Ok(handle)
+    }
+
+    fn save(&mut self, entity: &mut EntityHandle<T>) -> MaybeError {
+        let original_state = *entity;
+        if entity.real() {
+            let data = self.get_ref(entity).unwrap();
+            self.data_layer
+                .write_entity(data, &self.connection.lock())?;
+        } else {
+            let index = fast_position_of(self.temporal.as_slice(), entity).unwrap();
+            let data = &mut self.temporal[index];
+            self.data_layer.add_entity(data, &self.connection.lock())?;
+            entity.set_real(true);
+            entity.id = data.id();
+            entity.set_index(self.cache.len());
+            self.query_manger.handle_save(original_state, entity, data);
+
+            let data = self.temporal.remove(index);
+            self.cache.push(data);
+            self.shifts += 1;
+        }
+
+        Ok(())
+    }
+
+    fn delete(&mut self, mut handle: EntityHandle<T>) -> MaybeError {
+        let vec = if handle.real() {
+            self.data_layer
+                .delete_entity(handle.id, &self.connection.lock())?;
+            &mut self.cache
+        } else {
+            &mut self.temporal
+        };
+
+        let index = into_result(
+            fast_position_of(vec.as_slice(), &mut handle),
+            NotificationData::DbSaveError,
+        )?;
+        let value = vec.remove(index);
+        self.query_manger.handle_delete(&handle, &value);
+        self.shifts += 1;
+        Ok(())
+    }
+
+    fn find<F>(&self, predicate: F) -> Option<EntityHandle<T>>
+    where
+        F: Fn(&T) -> bool,
+    {
+        if let Some(index) = self.cache.iter().position(&predicate) {
+            let value = &self.cache[index];
+            return Some(EntityHandle::new(value.id(), index, true));
+        }
+
+        if let Some(index) = self.temporal.iter().position(predicate) {
+            let value = &self.temporal[index];
+            return Some(EntityHandle::new(value.id(), index, false));
+        }
+        None
+    }
+
+    fn init(&mut self) -> MaybeError {
+        self.data_layer
+            .load_all(&mut self.cache, &self.connection.lock())?;
+        self.version += 1;
+        Ok(())
+    }
+
+    fn start(&mut self) -> MaybeError {
+        if self.version != 0 {
+            return Ok(());
+        }
+
+        self.init()?;
+        Ok(())
+    }
+
+    fn reload(&mut self) -> MaybeError {
+        self.cache.clear();
+        self.temporal.clear();
+        self.init()?;
+        Ok(())
+    }
+
+    fn shifts(&self) -> usize {
+        self.shifts
+    }
+
+    fn iter<'a>(&'a self) -> impl Iterator<Item = &'a T>
+    where
+        T: 'a,
+    {
+        self.cache.iter().chain(self.temporal.iter())
+    }
+
+    fn iter_mut<'a>(&'a mut self) -> impl Iterator<Item = &'a mut T>
+    where
+        T: 'a,
+    {
+        self.cache.iter_mut().chain(self.temporal.iter_mut())
+    }
+}
+impl<T: EntityData + Clone, D: BatchedDbLayer<T> + DbLayer<T>> BatchedRepository<T, D>
+    for DataRepositoryInner<T, D>
+{
+    fn create_now_many(
+        &mut self,
+        entities: &mut [T],
+    ) -> Result<Vec<EntityHandle<T>>, NotificationData> {
+        self.data_layer
+            .add_many_entities(entities, &mut self.connection.lock())?;
+        let len = self.cache.len();
+        let handles = entities
+            .iter()
+            .enumerate()
+            .map(|(index, entity)| EntityHandle::new(entity.id(), index + len, true))
+            .collect();
+        self.cache.extend(entities.to_vec());
+        Ok(handles)
+    }
+
+    fn save_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError {
+        let mut temp = Vec::with_capacity(handles.len() / 2);
+        let mut cached = Vec::with_capacity(handles.len() / 2);
+        handles.sort_by_key(|a| a.id);
+        handles.iter_mut().for_each(|handle| {
+            if handle.real() {
+                cached.push(handle)
+            } else {
+                temp.push(handle)
+            }
+        });
+
+        let mut temp_values = Vec::with_capacity(temp.len());
+        let mut cell = 0;
+        let len = temp.len();
+        self.temporal.retain(|x| {
+            if cell == len {
+                return true;
+            }
+            let find = temp[cell].id;
+            let remove = x.id() == find;
+            if remove {
+                cell += 1;
+                temp_values.push(x.clone());
+            }
+            !remove
+        });
+
+        self.data_layer
+            .add_many_entities(&mut temp_values, &mut self.connection.lock())?;
+
+        let start = self.cache.len();
+
+        for (i, (handle, data)) in temp.into_iter().zip(&mut temp_values).enumerate() {
+            let old = *handle;
+            handle.id = data.id();
+            handle.set_index(start + i);
+            handle.set_real(true);
+            self.query_manger.handle_save(old, handle, data);
+        }
+
+        self.cache.extend(temp_values);
+
+        for handle in cached.into_iter() {
+            let h = handle;
+            let idx = fast_position_of(self.cache.as_slice(), h).unwrap();
+            self.data_layer
+                .write_entity(&self.cache[idx], &self.connection.lock())?;
+        }
+        self.shifts += 1;
+
+        Ok(())
+    }
+
+    fn delete_many(&mut self, handles: &mut [EntityHandle<T>]) -> MaybeError {
+        let (cached, temp) = split_temp_real(handles, |e| e.id);
+
+        let mut cell = 0;
+        let len = temp.len();
+        self.temporal.retain(|x| {
+            if cell == len {
+                return true;
+            }
+            let find = temp[cell];
+            let remove = x.id() == find;
+            if remove {
+                cell += 1;
+            }
+            !remove
+        });
+        self.data_layer
+            .delete_many_entities(cached.as_slice(), &mut self.connection.lock())?;
+        let len = cached.len();
+        cell = 0;
+        self.cache.retain(|x| {
+            if cell == len {
+                return true;
+            }
+            let find = cached[cell];
+            let remove = x.id() == find;
+            if remove {
+                cell += 1;
+            }
+
+            !remove
+        });
+        self.shifts += 1;
+
+        Ok(())
+    }
+}
+
+fn split_temp_real<T, F, V>(handles: &mut [EntityHandle<T>], getter: F) -> (Vec<V>, Vec<V>)
+where
+    F: Fn(&EntityHandle<T>) -> V,
+{
+    let mut temp = Vec::with_capacity(handles.len() / 2);
+    let mut cached = Vec::with_capacity(handles.len() / 2);
+    handles.sort_by_key(|a| a.id);
+    handles.iter().for_each(|handle| {
+        if handle.real() {
+            cached.push(getter(handle))
+        } else {
+            temp.push(getter(handle))
+        }
+    });
+    (cached, temp)
+}
+
+pub fn fast_position_of<E: EntityData>(
+    storage: &[E],
+    handle: &mut EntityHandle<E>,
+) -> Option<usize> {
+    if storage.is_empty() {
+        return None;
+    }
+
+    let max_idx = storage.len() - 1;
+    let upper = (handle.index()).min(max_idx);
+    let peek = storage[upper].id();
+
+    if peek == handle.id {
+        handle.set_index(upper);
+        return Some(upper);
+    }
+
+    if peek.0 < handle.id.0 {
+        return None;
+    }
+
+    let target_id_val = handle.id.0 as i64;
+    let peek_val = peek.0 as i64;
+    let delta = peek_val - target_id_val;
+
+    let new_index = (upper as i64 - delta).max(0) as usize;
+
+    if storage[new_index].id() == handle.id {
+        handle.set_index(new_index);
+        return Some(new_index);
+    }
+
+    if new_index == upper {
+        return None;
+    }
+
+    let index = storage[new_index..upper]
+        .binary_search_by(|e| e.id().cmp(&handle.id))
+        .ok()?
+        + new_index;
+
+    handle.set_index(index);
+    Some(index)
+}

src/data_provider/card_sets.rs

@@ -1,77 +0,0 @@
-use crate::core::srs::OrderMode;
-
-use crate::data::entities::DeckSettings;
-use crate::notification::NotificationData::{DbLoadError, DbSaveError};
-use crate::notification::{MaybeError, NotificationData};
-use rusqlite::Connection;
-
-pub fn load_sets(connection: &Connection) -> Result<Vec<DeckSettings>, NotificationData> {
-    let mut stmt = connection
-        .prepare("SELECT id, name, forward, backward, filter FROM card_set")
-        .expect("Failed to prepare state query");
-    let iter = stmt
-        .query_map([], |row| {
-            Ok(DeckSettings {
-                id: row.get(0)?,
-                name: row.get(1)?,
-                forward: row.get(2)?,
-                backward: row.get(3)?,
-                filter: row.get(4)?,
-                count: None,
-                open_mode: OrderMode::Default,
-            })
-        })
-        .map_err(|_| DbLoadError)?;
-
-    let mut buffer = Vec::with_capacity(16);
-    iter.filter_map(|res| res.ok()).for_each(|i| buffer.push(i));
-    Ok(buffer)
-}
-
-pub fn add_set(set: &mut DeckSettings, connection: &Connection) -> MaybeError {
-    let index : u32 = connection
-        .query_row(
-            "INSERT INTO card_set (name, forward, backward, filter) VALUES (?1, ?2, ?3, ?4) RETURNING id",
-            (
-                &set.name,
-                &set.forward,
-                &set.backward,
-                &set.filter,
-            ),
-            |row| row.get(0)
-        )
-        .map_err(|_| DbSaveError)?;
-
-    set.id = index.into();
-    Ok(())
-}
-
-pub fn update_deck(set: &mut DeckSettings, connection: &Connection) -> MaybeError {
-    if !set.id.is_valid() {
-        add_set(set, connection)?;
-    } else {
-        connection
-            .execute(
-                "UPDATE card_set SET name = ?1, forward = ?2, backward = ?3, filter = ?4 WHERE id = ?5",
-                (
-                    &set.name,
-                    &set.forward,
-                    &set.backward,
-                    &set.filter,
-                    &set.id
-                ),
-            )
-            .map_err(|_| DbSaveError)?;
-    }
-    Ok(())
-}
-
-pub fn delete_set(set: &DeckSettings, connection: &Connection) -> MaybeError {
-    if !set.id.is_valid() {
-        return Err(DbSaveError);
-    }
-    connection
-        .execute("DELETE FROM card_set WHERE id = ?1", (&set.id,))
-        .map_err(|_| DbSaveError)?;
-    Ok(())
-}

src/data_provider/card_states.rs

@@ -0,0 +1,103 @@
+use crate::data::entities::CardState;
+use crate::data::repositories::{DataRepository, DataRepositoryInner, Query};
+use crate::data::Id;
+use crate::data_access_methods;
+use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
+use chrono::NaiveDate;
+use fsrs::MemoryState;
+use rusqlite::{Error, Params, Row};
+use std::sync::Arc;
+
+data_access_methods!(
+    CardStateDbLayer,
+    CardStateRepository,
+    CardStateRepositoryInner,
+    CardState,
+    CardStatesQuerySet,
+    CardStateQuery
+);
+
+#[derive(Clone)]
+pub struct CardStatesQuerySet;
+impl TableAccessQuerySet<CardState> for CardStatesQuerySet {
+    fn load() -> &'static str {
+        "SELECT id, word_id, deck_id, score, last_opened, fsrs_opened, fsrs_memory, fsrs_open_day FROM states"
+    }
+
+    fn save() -> &'static str {
+        "UPDATE states SET score = ?1, last_opened = ?2, fsrs_opened = ?3, fsrs_memory = ?4, fsrs_open_day = ?5 WHERE id = ?6"
+    }
+
+    fn add() -> &'static str {
+        "INSERT INTO states (word_id, deck_id, score, last_opened, fsrs_opened, fsrs_memory, fsrs_open_day) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)"
+    }
+
+    fn name() -> &'static str {
+        "states"
+    }
+
+    fn from_sql(row: &Row) -> Result<CardState, Error> {
+        Ok(CardState {
+            id: row.get(0)?,
+            word_id: row.get(1)?,
+            deck_id: row.get(2)?,
+            score: row.get(3)?,
+            fsrs_opened: NaiveDate::from_epoch_days(row.get::<usize, i32>(5)?)
+                .expect("Incorrect date encoding"),
+            fsrs_memory: get_memory(row.get(6)?),
+            last_open: row.get(4)?,
+            fsrs_open_day: NaiveDate::from_epoch_days(row.get::<usize, i32>(7)?)
+                .expect("Incorrect date encoding"),
+        })
+    }
+
+    fn insert_params(entity: &CardState) -> impl Params {
+        (
+            entity.word_id,
+            entity.deck_id,
+            entity.score,
+            entity.last_open.timestamp(),
+            entity.fsrs_opened.to_epoch_days(),
+            memory_to_i64(&entity.fsrs_memory),
+            entity.fsrs_open_day.to_epoch_days(),
+        )
+    }
+
+    fn update_params(entity: &CardState) -> impl Params {
+        (
+            entity.score,
+            entity.last_open.timestamp(),
+            entity.fsrs_opened.to_epoch_days(),
+            memory_to_i64(&entity.fsrs_memory),
+            entity.fsrs_open_day.to_epoch_days(),
+            entity.id,
+        )
+    }
+}
+
+fn get_memory(value: i64) -> Option<MemoryState> {
+    if value == 0 {
+        return None;
+    }
+    Some(MemoryState {
+        stability: f32::from_bits(value as u32),
+        difficulty: f32::from_bits((value >> 32) as u32),
+    })
+}
+
+fn memory_to_i64(value: &Option<MemoryState>) -> i64 {
+    let Some(value) = &value else {
+        return 0;
+    };
+
+    value.stability.to_bits() as i64 | ((value.difficulty.to_bits() as i64) << 32)
+}
+
+impl CardStateRepositoryInner {
+    pub fn deck_states(
+        &self,
+        deck_id: Id,
+    ) -> Query<CardState, CardStateRepositoryInner, CardStateDbLayer> {
+        self.query(Arc::new(move |state| state.deck_id == deck_id))
+    }
+}

src/data_provider/card_stats.rs

@@ -1,100 +0,0 @@
-use crate::data::entities::{CardStatistics, DeckSettings};
-use crate::notification::NotificationData::{DbLoadError, DbSaveError};
-use crate::notification::{MaybeError, NotificationData};
-use log::info;
-use rusqlite::{Connection, params};
-use std::time::Instant;
-
-pub fn load_stats_of_deck(
-    set: &DeckSettings,
-    connection: &Connection,
-) -> Result<Vec<CardStatistics>, NotificationData> {
-    let mut stmt = connection
-        .prepare("SELECT id, word_id, score, last_opened FROM card_stats WHERE set_id = ?1")
-        .expect("Failed to prepare state query");
-    let iter = stmt
-        .query_map((set.id,), |row| {
-            Ok(CardStatistics {
-                id: row.get(0)?,
-                word_id: row.get(1)?,
-                set_id: set.id,
-                score: row.get(2)?,
-                last_open: row.get(3)?,
-            })
-        })
-        .map_err(|_| DbLoadError)?;
-
-    let mut buffer = Vec::with_capacity(512);
-    iter.filter_map(|res| res.ok()).for_each(|i| buffer.push(i));
-
-    Ok(buffer)
-}
-
-pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection) -> MaybeError {
-    let time = Instant::now();
-    let tx = connection
-        .transaction()
-        .expect("Failed to create transaction");
-    let count = stats.len();
-
-    {
-        let mut stmt = tx
-            .prepare(
-                "INSERT INTO card_stats (word_id, set_id, score, last_opened) VALUES (?1, ?2, ?3, ?4)",
-            )
-            .expect("Failed to prepare state query");
-
-        for stat in stats.iter() {
-            stmt.execute(params![
-                stat.word_id,
-                stat.set_id,
-                stat.score,
-                stat.last_open.timestamp()
-            ])
-            .map_err(|_| DbSaveError)?;
-        }
-    }
-
-    let last_index: u32 = tx.last_insert_rowid() as u32;
-    tx.commit().expect("Failed to commit");
-
-    let start_index = last_index - (count as u32) + 1;
-
-    for (index, id) in (start_index..=last_index).enumerate() {
-        stats[index].id = id.into();
-    }
-
-    info!("Added {} cards for {:?}", stats.len(), time.elapsed());
-    Ok(())
-}
-
-pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) -> MaybeError {
-    let time = Instant::now();
-
-    connection
-        .execute(
-            "UPDATE card_stats SET score = ?1, last_opened = ?2 WHERE id = ?3",
-            (&stat.score, &stat.last_open.timestamp(), &stat.id),
-        )
-        .map_err(|_| DbSaveError)?;
-    info!("Updated stat: {}", time.elapsed().as_millis());
-    Ok(())
-}
-
-pub fn delete_stats(stat: &[CardStatistics], connection: &Connection) -> MaybeError {
-    if stat.is_empty() {
-        return Ok(());
-    }
-    let ids = stat
-        .iter()
-        .map(|s| s.id.into())
-        .collect::<Vec<String>>()
-        .join(", ");
-    connection
-        .execute(
-            format!("DELETE FROM card_stats WHERE id in ({ids})").as_str(),
-            (),
-        )
-        .map_err(|_| DbSaveError)?;
-    Ok(())
-}

src/data_provider/custom_fields.rs

@@ -0,0 +1,42 @@
+use crate::data::entities::CustomField;
+use crate::data::repositories::{DataRepository, DataRepositoryInner};
+use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
+use rusqlite::{Error, Params, Row};
+use crate::data_access_methods;
+
+data_access_methods!(CustomFieldDbLayer, CustomFieldRepository, CustomFieldRepositoryInner, CustomField, CustomFieldsQuerySet, CustomFieldQuery);
+#[derive(Clone)]
+pub struct CustomFieldsQuerySet;
+impl TableAccessQuerySet<CustomField> for CustomFieldsQuerySet {
+    fn load() -> &'static str {
+        "SELECT id, name, identifier FROM custom_fields"
+    }
+
+    fn save() -> &'static str {
+        "UPDATE custom_fields SET name = ?1, identifier = ?2 WHERE id = ?3"
+    }
+
+    fn add() -> &'static str {
+        "INSERT INTO custom_fields (name, identifier) VALUES (?1, ?2)"
+    }
+
+    fn name() -> &'static str {
+        "custom_fields"
+    }
+
+    fn from_sql(row: &Row) -> Result<CustomField, Error> {
+        Ok(CustomField {
+            id: row.get(0)?,
+            name: row.get(1)?,
+            identifier: row.get(2)?,
+        })
+    }
+
+    fn insert_params(entity: &CustomField) -> impl Params {
+        (&entity.name, &entity.identifier)
+    }
+
+    fn update_params(entity: &CustomField) -> impl Params {
+        (&entity.name, &entity.identifier, entity.id)
+    }
+}

src/data_provider/decks.rs

@@ -0,0 +1,55 @@
+use crate::data::entities::DeckSettings;
+use crate::data::repositories::DataRepository;
+use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
+use rusqlite::{Error, Params, Row};
+
+pub type DeckRepository = DataRepository<DeckSettings, SqliteDbLayer<DeckSettings, DeckQuerySet>>;
+
+#[derive(Clone)]
+pub struct DeckQuerySet;
+impl TableAccessQuerySet<DeckSettings> for DeckQuerySet {
+    fn load() -> &'static str {
+        "SELECT id, name, forward, backward, filter FROM decks"
+    }
+
+    fn save() -> &'static str {
+        "UPDATE decks SET name = ?1, forward = ?2, backward = ?3, filter = ?4 WHERE id = ?5"
+    }
+
+    fn add() -> &'static str {
+        "INSERT INTO decks (name, forward, backward, filter) VALUES (?1, ?2, ?3, ?4)"
+    }
+
+    fn name() -> &'static str {
+        "decks"
+    }
+
+    fn from_sql(row: &Row) -> Result<DeckSettings, Error> {
+        Ok(DeckSettings {
+            id: row.get(0)?,
+            name: row.get(1)?,
+            forward: row.get(2)?,
+            backward: row.get(3)?,
+            filter: row.get(4)?,
+        })
+    }
+
+    fn insert_params(entity: &DeckSettings) -> impl Params {
+        (
+            &entity.name,
+            &entity.forward,
+            &entity.backward,
+            &entity.filter,
+        )
+    }
+
+    fn update_params(entity: &DeckSettings) -> impl Params {
+        (
+            &entity.name,
+            &entity.forward,
+            &entity.backward,
+            &entity.filter,
+            entity.id,
+        )
+    }
+}

src/data_provider/exam.rs

@@ -0,0 +1,98 @@
+use crate::data::entities::{Exam, ExamEntry};
+use crate::data::repositories::*;
+use crate::data_access_methods;
+use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
+use rusqlite::{Error, Params, Row};
+
+data_access_methods!(
+    ExamDataLayer,
+    ExamRepository,
+    ExamRepositoryInner,
+    Exam,
+    ExamQuerySet,
+    ExamQuery
+);
+
+data_access_methods!(
+    ExamEntryLayer,
+    ExamEntryRepository,
+    ExamEntryRepositoryInner,
+    ExamEntry,
+    ExamEntryQuerySet,
+    ExamEntryQuery
+);
+
+#[derive(Clone)]
+pub struct ExamQuerySet;
+
+impl TableAccessQuerySet<Exam> for ExamQuerySet {
+    fn load() -> &'static str {
+        "SELECT id, timestamp, deck_id FROM exams"
+    }
+
+    fn save() -> &'static str {
+        "UPDATE exams set deck_id = $1, timestamp = $2 WHERE id = $3"
+    }
+
+    fn add() -> &'static str {
+        "INSERT INTO exams (timestamp, deck_id) values ($1, $2)"
+    }
+
+    fn name() -> &'static str {
+        "exams"
+    }
+
+    fn from_sql(row: &Row) -> Result<Exam, Error> {
+        Ok(Exam {
+            id: row.get(0)?,
+            timestamp: row.get(1)?,
+            deck_id: row.get(2)?,
+        })
+    }
+
+    fn insert_params(entity: &Exam) -> impl Params {
+        (entity.timestamp.timestamp(), entity.deck_id)
+    }
+
+    fn update_params(entity: &Exam) -> impl Params {
+        (entity.timestamp.timestamp(), entity.deck_id, entity.id)
+    }
+}
+
+#[derive(Clone)]
+pub struct ExamEntryQuerySet;
+
+impl TableAccessQuerySet<ExamEntry> for ExamEntryQuerySet {
+    fn load() -> &'static str {
+        "SELECT id, exam_id, word_id, status FROM exam_entries"
+    }
+
+    fn save() -> &'static str {
+        "UPDATE exam_entries set status = $1 WHERE id = $2"
+    }
+
+    fn add() -> &'static str {
+        "INSERT into exam_entries (exam_id, word_id, status) VALUES ($1, $2, $3)"
+    }
+
+    fn name() -> &'static str {
+        "exam_entries"
+    }
+
+    fn from_sql(row: &Row) -> Result<ExamEntry, Error> {
+        Ok(ExamEntry {
+            id: row.get(0)?,
+            exam_id: row.get(1)?,
+            word_id: row.get(2)?,
+            status: row.get(3)?,
+        })
+    }
+
+    fn insert_params(entity: &ExamEntry) -> impl Params {
+        (entity.exam_id, entity.word_id, entity.status)
+    }
+
+    fn update_params(entity: &ExamEntry) -> impl Params {
+        (entity.status, entity.id)
+    }
+}

src/data_provider/history.rs

@@ -1,89 +1,94 @@
 use crate::core::srs::WordOpenMode;
-use crate::data::Id;
-use crate::data::entities::HistoryItem;
-use crate::fs::*;
-use crate::notification::NotificationData::PermissionDenied;
-use crate::notification::{MaybeError, NotificationData};
-use chrono::DateTime;
-use std::fs::{File, OpenOptions};
-use std::io::Write;
-use std::io::{BufRead, BufReader};
-use std::path::PathBuf;
+use crate::data::entities::HistoryNote;
+use crate::data::repositories::{DataRepository, DataRepositoryInner};
+use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
+use rusqlite::types::{FromSql, FromSqlResult, ToSqlOutput, ValueRef};
+use rusqlite::{Error, Params, Row, ToSql};
+use crate::data_access_methods;
 
-pub fn get_history_of_set(id: Id) -> Result<Vec<HistoryItem>, NotificationData> {
-    let app_dir = history_dir()?;
-    let head = app_dir.clone().join(format!("set_{}_history.csv", id));
-    let mut lines = Vec::new();
+data_access_methods!(HistoryDataLayer, HistoryRepository, HistoryRepositoryInner, HistoryNote, HistoryQuerySet, HistoryQuery);
 
-    append_lines_if_exists(head, &mut lines)?;
-    lines.reverse();
-    Ok(parse_history_items(lines))
+#[derive(Clone)]
+pub struct HistoryQuerySet;
+impl TableAccessQuerySet<HistoryNote> for HistoryQuerySet {
+    fn load() -> &'static str {
+        "SELECT rowid, deck_id, word_id, timestamp, answer, before, after, fsrs FROM history"
     }
 
-fn append_lines_if_exists(path: PathBuf, lines: &mut Vec<String>) -> MaybeError {
-    if path.exists() {
-        let reader = BufReader::new(File::open(path).map_err(|_| PermissionDenied)?);
-        reader
-            .lines()
-            .map_while(Result::ok)
-            .for_each(|i| lines.push(i));
-    }
-    Ok(())
+    fn save() -> &'static str {
+        todo!("History is readonly")
     }
 
-fn parse_history_items(strings: Vec<String>) -> Vec<HistoryItem> {
-    let mut items = Vec::with_capacity(strings.len());
-    for string in strings {
-        if let [time, word, mode, before, after] = string.split(';').collect::<Vec<&str>>()[..] {
-            let id = word.parse::<Id>();
-            if id.is_err() {
-                continue;
+    fn add() -> &'static str {
+        "INSERT INTO history (deck_id, word_id, timestamp, answer, before, after, fsrs) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)"
     }
-            let id = id.unwrap_or_default();
-            if !id.is_valid() {
-                continue;
+
+    fn name() -> &'static str {
+        "history"
     }
-            items.push(HistoryItem {
-                timestamp: DateTime::from_timestamp(time.parse().unwrap_or_default(), 0)
-                    .unwrap_or_default(),
-                word_id: id,
-                mode: match mode.parse::<u8>().unwrap_or_default() {
-                    2 => WordOpenMode::Hard,
-                    3 => WordOpenMode::Ok,
-                    4 => WordOpenMode::Easy,
-                    _ => WordOpenMode::None,
-                },
-                before: before.parse().unwrap_or_default(),
-                after: after.parse().unwrap_or_default(),
-            });
+
+    fn id_field() -> &'static str {
+        "rowid"
+    }
+    fn from_sql(row: &Row) -> Result<HistoryNote, Error> {
+        Ok(HistoryNote {
+            id: row.get(0)?,
+            timestamp: row.get(3)?,
+            deck_id: row.get(1)?,
+            word_id: row.get(2)?,
+            answer: row.get(4)?,
+            before: row.get(5)?,
+            after: row.get(6)?,
+            fsrs: row.get(7)?,
+        })
+    }
+
+    fn insert_params(entity: &HistoryNote) -> impl Params {
+        (
+            entity.deck_id,
+            entity.word_id,
+            entity.timestamp.timestamp(),
+            entity.answer,
+            entity.before,
+            entity.after,
+            entity.fsrs,
+        )
+    }
+
+    fn update_params(entity: &HistoryNote) -> impl Params {
+        (
+            entity.deck_id,
+            entity.word_id,
+            entity.timestamp.timestamp(),
+            entity.answer,
+            entity.before,
+            entity.after,
+            entity.fsrs,
+        )
     }
 }
 
-    items
+impl FromSql for WordOpenMode {
+    fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
+        if let ValueRef::Integer(s) = value {
+            return match s {
+                1 => Ok(WordOpenMode::Hard),
+                2 => Ok(WordOpenMode::Ok),
+                3 => Ok(WordOpenMode::Easy),
+                _ => Ok(WordOpenMode::None),
+            };
+        }
+        Ok(WordOpenMode::None)
+    }
 }
 
-pub fn push_note(set_id: Id, item: HistoryItem) -> MaybeError {
-    let app_dir = history_dir()?;
-    let path = app_dir.clone().join(format!("set_{}_history.csv", set_id));
-
-    let mut file = OpenOptions::new()
-        .create(true)
-        .append(true)
-        .open(path)
-        .map_err(|_| PermissionDenied)?;
-    let line_str = format!(
-        "{};{};{};{};{}",
-        item.timestamp.timestamp(),
-        item.word_id,
-        match item.mode {
-            WordOpenMode::Easy => 4,
-            WordOpenMode::Ok => 3,
-            WordOpenMode::Hard => 2,
-            WordOpenMode::None => 1,
-        },
-        item.before,
-        item.after
-    );
-    writeln!(&mut file, "{}", line_str).map_err(|_| PermissionDenied)?;
-    Ok(())
+impl ToSql for WordOpenMode {
+    fn to_sql(&self) -> rusqlite::Result<ToSqlOutput<'_>> {
+        Ok(ToSqlOutput::from(match self {
+            WordOpenMode::Easy => 3,
+            WordOpenMode::Ok => 2,
+            WordOpenMode::Hard => 1,
+            WordOpenMode::None => 0,
+        }))
+    }
 }

src/data_provider/import.rs

@@ -1,10 +1,11 @@
 use crate::helpers::into_result;
 use crate::notification::NotificationData;
 use crate::notification::NotificationData::IncorrectAnkiFile;
-use hashbrown::HashMap;
+use crate::pages::import::AnkiSchema;
 use log::info;
 use rusqlite::Connection;
 use serde_json::Value;
+use std::collections::BTreeMap;
 
 #[derive(Clone)]
 pub struct ImportData(pub(crate) Vec<ImportGroup>);
@@ -15,7 +16,7 @@ pub struct ImportGroup {
     pub name: String,
     pub fields: Vec<String>,
     pub length: u64,
-    pub mapping: HashMap<String, String>,
+    pub mapping: BTreeMap<String, String>,
     pub imported: bool,
 }
 
@@ -25,7 +26,17 @@ pub struct ImportNote {
     pub fields: Vec<String>,
 }
 
-pub fn load_groups(connection: &Connection) -> Result<ImportData, NotificationData> {
+pub fn load_groups(
+    connection: &Connection,
+    schema: AnkiSchema,
+) -> Result<ImportData, NotificationData> {
+    match schema {
+        AnkiSchema::Old => load_old_schema(connection),
+        AnkiSchema::Beta => load_new_schema(connection),
+    }
+}
+
+fn load_old_schema(connection: &Connection) -> Result<ImportData, NotificationData> {
     let json_models: String = connection
         .query_one("select models from col", (), |row| row.get(0))
         .map_err(|_| IncorrectAnkiFile)?;
@@ -45,7 +56,7 @@ pub fn load_groups(connection: &Connection) -> Result<ImportData, NotificationDa
             .collect::<Vec<(i64, i64)>>();
 
         for (_, collection) in sets {
-            let fields_property = collection.get("fields");
+            let fields_property = collection.get("flds");
             if let Some(fields_property) = fields_property {
                 let fields = into_result(fields_property.as_array(), IncorrectAnkiFile)?
                     .iter()
@@ -82,7 +93,9 @@ pub fn load_groups(connection: &Connection) -> Result<ImportData, NotificationDa
     }
     Err(IncorrectAnkiFile)
 }
-
+fn load_new_schema(_: &Connection) -> Result<ImportData, NotificationData> {
+    Err(IncorrectAnkiFile)
+}
 pub fn get_words_of_group(
     connection: &Connection,
     group_id: u64,

src/data_provider/mod.rs

@@ -1,9 +1,202 @@
-pub(crate) mod card_sets;
-pub(crate) mod card_stats;
+use crate::data::Id;
+use crate::data::entities::EntityData;
+use crate::data::repositories::{BatchedDbLayer, DbLayer};
+use crate::notification::MaybeError;
+use crate::notification::NotificationData::DbSaveError;
+use log::{debug, error};
+use rusqlite::{Connection, Error, Params, Row};
+use std::marker::PhantomData;
+use std::time::Instant;
+
+pub(crate) mod card_states;
+pub mod custom_fields;
+pub(crate) mod decks;
 pub(crate) mod history;
 pub(crate) mod import;
 pub(crate) mod settings;
 pub(crate) mod sqlite;
 pub(crate) mod voice;
 pub(crate) mod web_api;
+pub mod word_groups;
 pub(crate) mod words;
+pub(crate) mod exam;
+
+pub trait TableAccessQuerySet<T> {
+    fn load() -> &'static str;
+    fn save() -> &'static str;
+    fn add() -> &'static str;
+    fn name() -> &'static str;
+    fn id_field() -> &'static str {
+        "id"
+    }
+    fn from_sql(row: &Row) -> Result<T, Error>;
+    fn insert_params(entity: &T) -> impl Params;
+    fn update_params(entity: &T) -> impl Params;
+}
+
+#[derive(Clone)]
+pub struct SqliteDbLayer<T, Q>
+where
+    Q: TableAccessQuerySet<T>,
+{
+    _phantom: PhantomData<(T, Q)>,
+}
+
+impl<T, Q: TableAccessQuerySet<T>> Default for SqliteDbLayer<T, Q> {
+    fn default() -> Self {
+        Self {
+            _phantom: PhantomData,
+        }
+    }
+}
+
+impl<T: EntityData, Q: TableAccessQuerySet<T>> DbLayer<T> for SqliteDbLayer<T, Q> {
+    fn write_entity(&self, entity: &T, connection: &Connection) -> MaybeError {
+        let time = Instant::now();
+
+        connection
+            .execute(Q::save(), Q::update_params(entity))
+            .map_err(|e| {
+                error!("{}", e);
+                DbSaveError
+            })?;
+        debug!("Updated in {} for {:?}", Q::name(), time.elapsed());
+        Ok(())
+    }
+
+    fn add_entity(&mut self, entity: &mut T, connection: &Connection) -> MaybeError {
+        let time = Instant::now();
+
+        let index: u32 = connection
+            .query_row(
+                format!("{} RETURNING {}", Q::add(), Q::id_field()).as_str(),
+                Q::insert_params(entity),
+                |row| row.get(0),
+            )
+            .map_err(|e| {
+                error!("{}", e);
+                DbSaveError
+            })?;
+
+        entity.set_id(index.into());
+        debug!("Added into {} for {:?}", Q::name(), time.elapsed());
+        Ok(())
+    }
+
+    fn delete_entity(&mut self, id: Id, connection: &Connection) -> MaybeError {
+        let time = Instant::now();
+
+        if !id.is_valid() {
+            return Err(DbSaveError);
+        }
+        connection
+            .execute(
+                format!("DELETE FROM {} WHERE id = ?1", Q::name()).as_str(),
+                (&id,),
+            )
+            .map_err(|e| {
+                error!("{}", e);
+                DbSaveError
+            })?;
+        debug!("Deleted from {} for {:?}", Q::name(), time.elapsed());
+        Ok(())
+    }
+
+    fn load_all(&self, storage: &mut Vec<T>, connection: &Connection) -> MaybeError {
+        let time = Instant::now();
+
+        let mut stmt = connection
+            .prepare(Q::load())
+            .expect("Failed to prepare state query");
+        let iter = stmt.query_map([], |row| Q::from_sql(row)).map_err(|e| {
+            error!("{}", e);
+            DbSaveError
+        })?;
+
+        iter.filter_map(|res| res.ok())
+            .for_each(|i| storage.push(i));
+        debug!(
+            "Loaded {} from {} for {:?}",
+            storage.len(),
+            Q::name(),
+            time.elapsed()
+        );
+
+        Ok(())
+    }
+}
+
+impl<T: EntityData, Q: TableAccessQuerySet<T>> BatchedDbLayer<T> for SqliteDbLayer<T, Q> {
+    fn delete_many_entities(&mut self, ids: &[Id], connection: &mut Connection) -> MaybeError {
+        let time = Instant::now();
+
+        for chunk in ids.chunks(1000) {
+            let stringed = chunk
+                .iter()
+                .map(|i| i.to_string())
+                .collect::<Vec<_>>()
+                .join(",");
+            connection
+                .execute(
+                    format!("DELETE FROM {} WHERE id in ({})", Q::name(), stringed).as_str(),
+                    (),
+                )
+                .map_err(|e| {
+                    error!("{}", e);
+                    DbSaveError
+                })?;
+        }
+        debug!(
+            "Deleted {} from {} for {:?}",
+            ids.len(),
+            Q::name(),
+            time.elapsed()
+        );
+
+        Ok(())
+    }
+
+    fn add_many_entities(&mut self, entities: &mut [T], connection: &mut Connection) -> MaybeError {
+        let time = Instant::now();
+        let tx = connection
+            .transaction()
+            .expect("Failed to create transaction");
+        let count = entities.len();
+
+        {
+            let mut stmt = tx.prepare(Q::add()).expect("Failed to prepare state query");
+            for entity in entities.iter() {
+                stmt.execute(Q::insert_params(entity)).map_err(|e| {
+                    error!("{}", e);
+                    DbSaveError
+                })?;
+            }
+        }
+
+        let last_index: u32 = tx.last_insert_rowid() as u32;
+        tx.commit().expect("Failed to commit");
+
+        let start_index = last_index - (count as u32) + 1;
+
+        for (index, id) in (start_index..=last_index).enumerate() {
+            entities[index].set_id(id.into());
+        }
+
+        debug!(
+            "Added {} into {} for {:?}",
+            entities.len(),
+            Q::name(),
+            time.elapsed()
+        );
+        Ok(())
+    }
+}
+
+#[macro_export]
+macro_rules! data_access_methods {
+    ($layer:ident, $repo:ident, $repoinner:ident, $data:ty, $queryset:ty, $query:ident) => {
+pub type $repo = DataRepository<$data, $layer>;
+pub type $repoinner = DataRepositoryInner<$data, $layer>;
+pub type $layer = SqliteDbLayer<$data, $queryset>;
+    };
+}

src/data_provider/sqlite.rs

@@ -1,5 +1,7 @@
 use crate::fs::*;
+use log::error;
 use rusqlite::Connection;
+use std::ops::{Deref, DerefMut};
 
 pub fn create_db() {
     let db_file = db_path();
@@ -20,6 +22,10 @@ fn create_tables(conn: &Connection) {
     make_word_group(conn).expect("Failed to init table");
     make_words(conn).expect("Failed to init table");
     make_card_stats(conn).expect("Failed to init table");
+    make_history(conn).expect("Failed to init table");
+    make_custom_fields(conn).expect("Failed to init table");
+    make_exams(conn).expect("Failed to init table");
+    make_exam_entry(conn).expect("Failed to init table");
 }
 
 fn make_settings(conn: &Connection) -> Result<(), rusqlite::Error> {
@@ -29,15 +35,15 @@ fn make_settings(conn: &Connection) -> Result<(), rusqlite::Error> {
 }
 
 fn make_card_set(conn: &Connection) -> Result<(), rusqlite::Error> {
-    let query = include_str!("../../sql/card_set.sql");
+    let query = include_str!("../../sql/decks.sql");
     conn.execute(query, ())?;
     Ok(())
 }
 
 fn make_word_group(conn: &Connection) -> Result<(), rusqlite::Error> {
-    let query = include_str!("../../sql/word_group.sql");
+    let query = include_str!("../../sql/word_groups.sql");
     conn.execute(query, ())?;
-    conn.execute("insert into word_group (name) values (\"Слова\");", ())?;
+    conn.execute("insert into word_groups (name) values (\"Слова\");", ())?;
     Ok(())
 }
 fn make_words(conn: &Connection) -> Result<(), rusqlite::Error> {
@@ -46,7 +52,32 @@ fn make_words(conn: &Connection) -> Result<(), rusqlite::Error> {
     Ok(())
 }
 fn make_card_stats(conn: &Connection) -> Result<(), rusqlite::Error> {
-    let query = include_str!("../../sql/card_stats.sql");
+    let query = include_str!("../../sql/states.sql");
+    conn.execute(query, ())?;
+    Ok(())
+}
+
+fn make_history(conn: &Connection) -> Result<(), rusqlite::Error> {
+    let query = include_str!("../../sql/history.sql");
+    conn.execute(query, ())?;
+    Ok(())
+}
+
+fn make_custom_fields(conn: &Connection) -> Result<(), rusqlite::Error> {
+    let query = include_str!("../../sql/custom_fields.sql");
+    conn.execute(query, ())?;
+    conn.execute("insert into custom_fields (name, identifier) values (\"Чтение\", \"reading\"), (\"Описание\", \"description\"), (\"Пример использования\", \"context\")", ())?;
+    Ok(())
+}
+
+fn make_exams(conn: &Connection) -> Result<(), rusqlite::Error> {
+    let query = include_str!("../../sql/exam.sql");
+    conn.execute(query, ())?;
+    Ok(())
+}
+
+fn make_exam_entry(conn: &Connection) -> Result<(), rusqlite::Error> {
+    let query = include_str!("../../sql/exam_entry.sql");
     conn.execute(query, ())?;
     Ok(())
 }
@@ -58,4 +89,60 @@ pub fn default_connection() -> Connection {
         .execute("PRAGMA foreign_keys = ON;", [])
         .expect("Failed to set PRAGMA");
     connection
+        .query_one("PRAGMA journal_mode = WAL;", [], |row| {
+            Ok(())
+        })
+        .expect("Failed to init database");
+    connection
+        .execute("PRAGMA synchronous = NORMAL;", [])
+        .expect("Failed to set PRAGMA");
+    connection
+}
+
+pub struct SqliteConnection(Option<Connection>);
+impl Deref for SqliteConnection {
+    type Target = Connection;
+    fn deref(&self) -> &Self::Target {
+        self.0.as_ref().unwrap()
+    }
+}
+
+impl DerefMut for SqliteConnection {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        self.0.as_mut().unwrap()
+    }
+}
+
+impl Default for SqliteConnection {
+    fn default() -> Self {
+        SqliteConnection(Some(default_connection()))
+    }
+}
+
+impl SqliteConnection {
+    pub fn finish(&mut self) {
+        let connection = self.0.take().unwrap();
+        connection
+            .query_row("PRAGMA wal_checkpoint(TRUNCATE)", [], |_| Ok(()))
+            .unwrap_or_else(|e| {
+                error!("Ошибка при checkpoint WAL: {e}");
+            });
+        connection
+            .execute("PRAGMA optimize", [])
+            .unwrap_or_else(|e| {
+                error!("Ошибка при  оптимизации БД: {e}");
+                0
+            });
+
+        self.0 = None;
+    }
+    pub fn restart(&mut self) {
+        self.0 = Some(default_connection());
+    }
+}
+
+impl Drop for SqliteConnection {
+    fn drop(&mut self) {
+        self.finish();
+    }
 }

src/data_provider/web_api.rs

@@ -1,9 +1,12 @@
 use crate::fs::*;
-use crate::notification::NotificationData::{CompressError, PermissionDenied, WebApiUnavailable};
+use crate::notification::NotificationData::{
+    CompressError, OpenFileError, PermissionDenied, WebApiUnavailable,
+};
 use crate::notification::{MaybeError, NotificationData};
-use log::info;
+use log::{debug, info};
 use std::io;
-use tokio::fs::{File, OpenOptions};
+use std::time::Instant;
+use tokio::fs::{File, OpenOptions, remove_file};
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use zstd::{DEFAULT_COMPRESSION_LEVEL, Decoder, Encoder};
 
@@ -35,10 +38,13 @@ pub async fn send_data(id: String) -> MaybeError {
 }
 
 fn compress(data: Vec<u8>) -> Result<Vec<u8>, NotificationData> {
+    let time = Instant::now();
     let mut encoder =
-        Encoder::new(Vec::new(), DEFAULT_COMPRESSION_LEVEL).map_err(|_| CompressError)?;
+        Encoder::new(Vec::new(), 17).map_err(|_| CompressError)?;
     io::copy(&mut &data[..], &mut encoder).map_err(|_| PermissionDenied)?;
-    encoder.finish().map_err(|_| CompressError)
+    let result = encoder.finish().map_err(|_| CompressError);
+    debug!("Compress time: {:?}", time.elapsed());
+    result
 }
 
 pub async fn load_data(id: String, temp: bool) -> MaybeError {
@@ -49,7 +55,7 @@ pub async fn load_data(id: String, temp: bool) -> MaybeError {
         .get(&id_url)
         .send()
         .await
-        .map_err(|_| WebApiUnavailable)?
+        .map_err(|e| WebApiUnavailable)?
         .bytes()
         .await
         .map_err(|_| WebApiUnavailable)?
@@ -74,6 +80,12 @@ pub async fn load_data(id: String, temp: bool) -> MaybeError {
         .await
         .map_err(|_| WebApiUnavailable)?;
     set_local_version(version.parse::<u32>().unwrap_or_default()).await?;
+    if db_wal().exists() {
+        remove_file(db_wal()).await.map_err(|_| OpenFileError)?;
+    }
+    if db_shm().exists() {
+        remove_file(db_shm()).await.map_err(|_| OpenFileError)?;
+    }
     Ok(())
 }
 

src/data_provider/word_groups.rs

@@ -0,0 +1,42 @@
+use crate::data::entities::WordGroup;
+use crate::data::repositories::{DataRepository, DataRepositoryInner};
+use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
+use rusqlite::{Error, Params, Row};
+use crate::data_access_methods;
+
+data_access_methods!(WordGroupDataLayer, WordGroupRepository, WordGroupRepositoryInner, WordGroup, WordGroupQuerySet, WordGroupQuery);
+
+#[derive(Clone)]
+pub struct WordGroupQuerySet;
+impl TableAccessQuerySet<WordGroup> for WordGroupQuerySet {
+    fn load() -> &'static str {
+        "SELECT id, name FROM word_groups"
+    }
+
+    fn save() -> &'static str {
+        "UPDATE word_groups SET name = ?1 WHERE id = ?2"
+    }
+
+    fn add() -> &'static str {
+        "INSERT INTO word_groups (name) VALUES (?1)"
+    }
+
+    fn name() -> &'static str {
+        "word_groups"
+    }
+
+    fn from_sql(row: &Row) -> Result<WordGroup, Error> {
+        Ok(WordGroup {
+            id: row.get(0)?,
+            name: row.get(1)?,
+        })
+    }
+
+    fn insert_params(entity: &WordGroup) -> impl Params {
+        (&entity.name,)
+    }
+
+    fn update_params(entity: &WordGroup) -> impl Params {
+        (&entity.name, entity.id)
+    }
+}

src/data_provider/words.rs

@@ -1,173 +1,85 @@
-use crate::data::entities::{WordData, WordGroup};
-use crate::notification::NotificationData::{DbLoadError, DbSaveError};
-use crate::notification::{MaybeError, NotificationData};
-use rusqlite::{Connection, params};
-use std::collections::HashMap;
+use crate::data::Id;
+use crate::data::entities::WordData;
+use crate::data::repositories::{DataRepository, DataRepositoryInner};
+use crate::data_provider::{SqliteDbLayer, TableAccessQuerySet};
+use litemap::LiteMap;
+use rusqlite::{Error, Params, Row};
+use crate::data_access_methods;
 
-pub fn add_word(word: &mut WordData, connection: &Connection) -> MaybeError {
-    let index : u32 = connection
-        .query_row(
-            "INSERT INTO words (key, value, tags, more, group_id) VALUES (?1, ?2, ?3, ?4, ?5) RETURNING id",
-            (
-                &word.key,
-                &word.value,
-                &word.tags,
-                serde_json::to_string(&word.additional).unwrap_or_default(),
-                &word.group_id,
-            ),
-            |row| row.get(0),
-        ).map_err(|_| DbSaveError)?;
+data_access_methods!(WordDataLayer, WordRepository, WordRepositoryInner, WordData, WordQuerySet, WordQuery);
 
-    word.id = index.into();
-    Ok(())
+#[derive(Clone)]
+pub struct WordQuerySet;
+impl TableAccessQuerySet<WordData> for WordQuerySet {
+    fn load() -> &'static str {
+        "SELECT id, key, value, tags, more, group_id FROM words"
     }
 
-pub fn add_words(words: &mut [WordData], connection: &mut Connection) -> MaybeError {
-    let tx = connection.transaction().map_err(|_| DbLoadError)?;
-    let count = words.len();
-
-    {
-        let mut stmt = tx
-            .prepare(
-                "INSERT INTO words (key, value, tags, more, group_id) VALUES (?1, ?2, ?3, ?4, ?5)",
-            )
-            .expect("Failed to prepare statement");
-
-        for word in words.iter() {
-            stmt.execute(params![
-                word.key,
-                word.value,
-                word.tags,
-                serde_json::to_string(&word.additional).unwrap_or_default(),
-                word.group_id
-            ])
-            .map_err(|_| DbSaveError)?;
-        }
+    fn save() -> &'static str {
+        "UPDATE words SET key = ?1, value = ?2, tags = ?3, more = ?4 WHERE id = ?5"
     }
 
-    let last_index: u32 = tx.last_insert_rowid() as u32;
-    tx.commit().map_err(|_| DbSaveError)?;
-
-    let start_index = last_index - (count as u32) + 1;
-
-    for (index, id) in (start_index..=last_index).enumerate() {
-        words[index].id = id.into();
+    fn add() -> &'static str {
+        "INSERT INTO words (key, value, tags, more, group_id) VALUES (?1, ?2, ?3, ?4, ?5)"
     }
 
-    Ok(())
+    fn name() -> &'static str {
+        "words"
     }
 
-pub fn update_word(word: &mut WordData, connection: &Connection) -> MaybeError {
-    if !word.id.is_valid() {
-        Ok(add_word(word, connection)?)
-    } else {
-        connection
-            .execute(
-                "UPDATE words SET key = ?1, value = ?2, tags = ?3, more = ?4 WHERE id = ?5",
-                (
-                    &word.key,
-                    &word.value,
-                    &word.tags,
-                    serde_json::to_string(&word.additional).map_err(|_| DbSaveError)?,
-                    &word.id,
-                ),
-            )
-            .map_err(|_| DbSaveError)?;
-        Ok(())
-    }
-}
-
-pub fn delete_word(word: &WordData, connection: &Connection) -> MaybeError {
-    if !word.id.is_valid() {
-        return Err(DbSaveError);
-    }
-    connection
-        .execute("DELETE FROM words WHERE id = ?1", (&word.id,))
-        .map_err(|_| DbSaveError)?;
-    Ok(())
-}
-
-pub fn load_words(connection: &Connection) -> Result<Vec<WordData>, NotificationData> {
-    let mut stmt = connection
-        .prepare("SELECT id, key, value, tags, more, group_id FROM words")
-        .expect("Failed to prepare statement");
-    let word_iter = stmt
-        .query_map([], |row| {
+    fn from_sql(row: &Row) -> Result<WordData, Error> {
         let additional: String = row.get(4)?;
         Ok(WordData {
             id: row.get(0)?,
             key: row.get(1)?,
             value: row.get(2)?,
             tags: row.get(3)?,
-                additional: serde_json::from_str::<HashMap<String, String>>(&additional)
-                    .unwrap_or_default(),
+            additional: additional_from_string(additional),
             group_id: row.get(5)?,
         })
-        })
-        .map_err(|_| DbLoadError)?;
-
-    let mut buffer = Vec::with_capacity(1024);
-    word_iter
-        .filter_map(|res| res.ok())
-        .for_each(|i| buffer.push(i));
-
-    Ok(buffer)
     }
 
-pub fn load_word_groups(connection: &Connection) -> Result<Vec<WordGroup>, NotificationData> {
-    let mut stmt = connection
-        .prepare("SELECT id, name FROM word_group")
-        .expect("Failed to prepare statement");
-    let group_iter = stmt
-        .query_map([], |row| {
-            Ok(WordGroup {
-                id: row.get(0)?,
-                name: row.get(1)?,
-            })
-        })
-        .map_err(|_| DbLoadError)?;
-
-    let mut buffer = Vec::with_capacity(8);
-    group_iter
-        .filter_map(|res| res.ok())
-        .for_each(|i| buffer.push(i));
-
-    Ok(buffer)
-}
-
-pub fn add_group(group: &mut WordGroup, connection: &Connection) -> MaybeError {
-    let index: u32 = connection
-        .query_row(
-            "INSERT INTO word_group (name) VALUES (?1) RETURNING id",
-            (&group.name,),
-            |row| row.get(0),
+    fn insert_params(entity: &WordData) -> impl Params {
+        (
+            &entity.key,
+            &entity.value,
+            &entity.tags,
+            additional_to_string(&entity.additional),
+            entity.group_id,
         )
-        .map_err(|_| DbSaveError)?;
-
-    group.id = index.into();
-    Ok(())
     }
 
-pub fn update_group(group: &mut WordGroup, connection: &Connection) -> MaybeError {
-    if !group.id.is_valid() {
-        Ok(add_group(group, connection)?)
-    } else {
-        connection
-            .execute(
-                "UPDATE word_group SET name = ?1 WHERE id = ?2",
-                (&group.name, &group.id),
+    fn update_params(entity: &WordData) -> impl Params {
+        (
+            &entity.key,
+            &entity.value,
+            &entity.tags,
+            additional_to_string(&entity.additional),
+            entity.id,
         )
-            .map_err(|_| DbSaveError)?;
-        Ok(())
     }
 }
 
-pub fn delete_group(group: &WordGroup, connection: &Connection) -> MaybeError {
-    if !group.id.is_valid() {
-        return Err(DbSaveError);
+fn additional_to_string(map: &LiteMap<Id, String>) -> String {
+    let mut parts = Vec::with_capacity(map.len() * 2);
+    for (id, value) in map {
+        parts.push(id.to_string());
+        parts.push(value.clone());
     }
-    connection
-        .execute("DELETE FROM word_group WHERE id = ?1", (&group.id,))
-        .map_err(|_| DbSaveError)?;
-    Ok(())
+    parts.join("")
+}
+
+fn additional_from_string(data: String) -> LiteMap<Id, String> {
+    if data.is_empty() {
+        return LiteMap::new();
+    }
+    let parts = data.split('').collect::<Vec<&str>>();
+    let chunks = parts.chunks(2).collect::<Vec<&[&str]>>();
+    let mut map = LiteMap::with_capacity(parts.len());
+    for part in &chunks {
+        let id: Id = part[0].parse().unwrap();
+        let value: String = part[1].to_string();
+        map.insert(id, value);
+    }
+    map
 }

src/fs.rs

@@ -16,6 +16,14 @@ pub fn app_data_dir() -> PathBuf {
 pub fn db_path() -> PathBuf {
     app_data_dir().join("data.db")
 }
+
+pub fn db_wal() -> PathBuf {
+    app_data_dir().join("data.db-wal")
+}
+pub fn db_shm() -> PathBuf {
+    app_data_dir().join("data.db-shm")
+}
+
 pub fn temp_db_path() -> PathBuf {
     app_data_dir().join("data.db.tmp")
 }
@@ -28,14 +36,6 @@ pub fn db_meta_path() -> PathBuf {
     app_data_dir().join("data.meta")
 }
 
-pub fn history_dir() -> Result<PathBuf, NotificationData> {
-    let directory = app_data_dir().join("history");
-    if !directory.exists() {
-        fs::create_dir_all(directory.clone()).map_err(|_| PermissionDenied)?;
-    }
-    Ok(directory)
-}
-
 pub fn voice_dir() -> Result<PathBuf, NotificationData> {
     let directory = app_data_dir().join("voice");
     if !directory.exists() {

src/main.rs

@@ -9,6 +9,8 @@ mod navigation;
 pub mod notification;
 mod pages;
 mod styling;
+pub mod tests;
+pub mod widgets;
 
 use crate::app::start;
 use mimalloc::MiMalloc;

src/navigation.rs

@@ -1,21 +1,18 @@
-use crate::app::{AppState, fill_state};
-use crate::data::Id;
-use crate::data_provider::history::get_history_of_set;
-use crate::data_provider::sqlite::{create_db, default_connection};
+use crate::app::{fill_state, AppState};
+use crate::data_provider::sqlite::create_db;
 use crate::data_provider::web_api::{
     get_local_version, get_web_version, load_data, set_local_version,
 };
 use crate::fs::*;
 use crate::navigation::Page::*;
-use crate::navigation::RootMessage::{
-    DataLoaded, Keyboard, Notification, PushNotification, UpdateData,
-};
+use crate::navigation::RootMessage::{Keyboard, Notification, PushNotification, UpdateData};
 use crate::notification::NotificationData::PermissionDenied;
 use crate::notification::{
     NotificationData, NotificationManager, NotificationMessage, NotificationRequest,
 };
 use crate::pages::dictionary::{DictionaryMessage, DictionaryState};
 use crate::pages::dictionary_quiz::{DictionaryQuizMessage, DictionaryQuizState};
+use crate::pages::exams::{ExamsMessage, ExamsState};
 use crate::pages::history::{HistoryMessage, HistoryState};
 use crate::pages::import::{ImportMessage, ImportState};
 use crate::pages::quiz::{QuizMessage, QuizState};
@@ -25,29 +22,23 @@ use crate::pages::repetition_settings::{RepetitionSettingsMessage, RepetitionSet
 use crate::pages::repetitions::{RepetitionsMessage, RepetitionsState};
 use crate::pages::selector::{SelectorMessage, SelectorState};
 use crate::pages::sync::{SyncMessage, SyncState};
-use crate::pages::word::{WordMessage, WordState};
 use crate::pages::writing::{WritingMessage, WritingState};
 use crate::state_navigate_handle;
 use crate::state_update;
 use crate::view_navigation;
 use crate::{message_navigation, push_error, push_error_task};
-use chrono::NaiveDate;
-use hashbrown::HashMap;
 use iced::keyboard::Event;
 use iced::widget::stack;
 use iced::{Element, Task};
 use iced_core::Length::Fill;
-use log::info;
-use parking_lot::Mutex;
-use rusqlite::Connection;
-use std::sync::Arc;
+use log::{debug, info};
 use std::time::Instant;
+use crate::pages::exam::{ExamMessage, ExamState};
 
 impl Default for ScreenState {
     fn default() -> Self {
         let mut state = AppState::new();
         fill_state(&mut state);
-        let state = Arc::new(Mutex::new(state));
         ScreenState {
             stack: vec![Selector(SelectorState::new(state.clone()))],
             app_state: state.clone(),
@@ -66,13 +57,13 @@ pub enum RootMessage {
     Randomizer(RandomizerMessage),
     Repetitions(RepetitionsMessage),
     Repetition(RepetitionMessage),
-    Word(WordMessage),
     Sync(SyncMessage),
     History(HistoryMessage),
     RepetitionSettings(RepetitionSettingsMessage),
     Import(ImportMessage),
+    Exams(ExamsMessage),
+    Exam(ExamMessage),
     Keyboard(Event),
-    DataLoaded(HashMap<Id, Vec<(NaiveDate, u32)>>),
     PushNotification(NotificationRequest),
     Notification(NotificationMessage),
     None,
@@ -89,17 +80,18 @@ pub enum Page {
     Randomizer(RandomizerState),
     Repetitions(RepetitionsState),
     Repetition(RepetitionState),
-    Word(WordState),
     Sync(SyncState),
     History(HistoryState),
     RepetitionSettings(RepetitionSettingsState),
     Import(ImportState),
+    Exams(ExamsState),
+    Exam(ExamState),
     PreviousPage,
 }
 
 pub struct ScreenState {
     stack: Vec<Page>,
-    app_state: Arc<Mutex<AppState>>,
+    app_state: AppState,
     notification_manager: NotificationManager,
 }
 
@@ -109,14 +101,11 @@ impl ScreenState {
         create_db();
         info!("Db created");
         let state = ScreenState::default();
-        let reading_additional_task = Task::perform(Self::load_additional_data(), |data| {
-            data.unwrap_or_else(|err| push_error!(err))
-        });
 
-        let mut final_task = reading_additional_task;
-        let state_guard = state.app_state.lock();
-        if state_guard.sync_data.auto_web_fetch
-            && let Some(key) = state_guard.sync_data.key.clone()
+        let mut final_task = Task::none();
+        let state_guard = &state.app_state;
+        if state_guard.sync_data.read().auto_web_fetch
+            && let Some(key) = state_guard.sync_data.read().key.clone()
         {
             final_task = Task::batch([
                 final_task,
@@ -133,43 +122,10 @@ impl ScreenState {
             ]);
         }
 
-        drop(state_guard);
         info!("Boot finished");
         (state, final_task)
     }
 
-    async fn load_additional_data() -> Result<RootMessage, NotificationData> {
-        let directory = history_dir()?;
-
-        let mut map = HashMap::new();
-        for file in directory
-            .read_dir()
-            .map_err(|_| PermissionDenied)?
-            .filter_map(Result::ok)
-        {
-            let mut vec = vec![];
-            let history_file_name = match file.file_name().into_string() {
-                Err(_) => continue,
-                Ok(v) => v,
-            };
-
-            if let Ok(id) = history_file_name.split('_').collect::<Vec<_>>()[1].parse::<Id>()
-                && let Ok(history) = get_history_of_set(id)
-            {
-                let by_date = history.chunk_by(|x, x1| {
-                    x.timestamp.naive_local().date() == x1.timestamp.naive_local().date()
-                });
-                for group in by_date {
-                    vec.push((group[0].timestamp.naive_local().date(), group.len() as u32));
-                }
-                map.insert(id, vec);
-            } else {
-                continue;
-            }
-        }
-        Ok(DataLoaded(map))
-    }
-
     async fn load_web_backup(string: String) -> Result<bool, NotificationData> {
         let local = get_local_version().await?;
         let web = get_web_version(string.as_str()).await?;
@@ -191,16 +147,11 @@ impl ScreenState {
             return self.handle_keyboard(e);
         }
 
-        if let DataLoaded(data) = message {
-            self.app_state.lock().activity = data;
-            return Task::none();
-        }
-
         if let UpdateData = message {
             info!("Loading data");
-            let mut state = self.app_state.lock();
+            let state = &mut self.app_state;
             if cfg!(windows) {
-                state.connection = Connection::open_in_memory().unwrap();
+                state.connection.lock().finish();
             }
             let db_file = db_path();
             let temp_db_file = temp_db_path();
@@ -208,8 +159,8 @@ impl ScreenState {
                 return push_error_task!(PermissionDenied);
             }
 
-            state.connection = default_connection();
-            fill_state(&mut state);
+            state.connection = Default::default();
+            fill_state(state);
             return Task::none();
         }
 
@@ -234,14 +185,15 @@ impl ScreenState {
                 Randomizer,
                 Repetitions,
                 Repetition,
-                Word,
                 Sync,
                 History,
                 RepetitionSettings,
-                Import
+                Import,
+                Exams,
+                Exam
             );
         }
-        info!("Update took {:?}", time.elapsed());
+        debug!("Update took {:?}", time.elapsed());
 
         task.0
     }
@@ -258,11 +210,12 @@ impl ScreenState {
             Randomizer,
             Repetitions,
             Repetition,
-            Word,
             Sync,
             History,
             RepetitionSettings,
-            Import
+            Import,
+            Exams,
+                Exam
         )
     }
 
@@ -279,16 +232,17 @@ impl ScreenState {
             Randomizer,
             Repetitions,
             Repetition,
-            Word,
             Sync,
             History,
             RepetitionSettings,
-            Import
+            Import,
+            Exams,
+                Exam
         );
 
         let notifications = self.notification_manager.draw().map(Notification);
 
-        info!("View took {:?}", time.elapsed());
+        debug!("View took {:?}", time.elapsed());
         stack![view, notifications].width(Fill).height(Fill).into()
     }
 
@@ -296,6 +250,8 @@ impl ScreenState {
         if let Some(page) = self.stack.last_mut() {
             return match page {
                 Repetition(page) => page.press(&message),
+                Dictionary(page) => page.press(&message),
+                Exam(page) => page.press(&message),
                 _ => Task::none(),
             };
         }

src/notification.rs

@@ -138,8 +138,8 @@ impl NotificationManager {
 
     fn draw_data<'a>(data: &NotificationData) -> Element<'a, NotificationMessage> {
         match data {
-            NotificationData::DataLoaded => {
-                text!("Данные успешно скачаны")
+            NotificationData::DataSynced => {
+                text!("Данные успешно синхронизированы")
             }
             NotificationData::ImportError => {
                 text!("Ошибка при импорте данных из Anki")
@@ -148,13 +148,13 @@ impl NotificationManager {
                 text!("Неподдерживаемый формат файла .apkg")
             }
             NotificationData::OpenFileError => {
-                text!("Ошибка открытия файла пакета")
+                text!("Ошибка открытия файла")
             }
             NotificationData::VoiceVoxUnavailable => {
                 text!("Не получается подключиться к VoiceVox")
             }
             NotificationData::PermissionDenied => {
-                text!("У приложение недостаточно прав")
+                text!("У приложение недостаточно прав для доступа в файлам")
             }
             NotificationData::WebApiUnavailable => {
                 text!("Не получается подключиться к Api")
@@ -168,6 +168,9 @@ impl NotificationManager {
             NotificationData::CompressError => {
                 text!("Ошибка сжатия или распаковки данных")
             }
+            NotificationData::LocalVersionChanged => {
+                text!("Локальная версия будет заменена")
+            }
         }
         .width(Fill)
         .into()
@@ -184,7 +187,7 @@ pub enum NotificationRequest {
 #[derive(Clone, Debug)]
 pub enum NotificationData {
     PermissionDenied,
-    DataLoaded,
+    DataSynced,
     ImportError,
     IncorrectAnkiFile,
     OpenFileError,
@@ -193,6 +196,7 @@ pub enum NotificationData {
     DbSaveError,
     DbLoadError,
     CompressError,
+    LocalVersionChanged,
 }
 
 pub type MaybeError = Result<(), NotificationData>;

src/pages.rs

@@ -11,3 +11,5 @@ pub mod selector;
 pub mod sync;
 pub mod word;
 pub mod writing;
+pub mod exams;
+pub mod exam;

src/pages/dictionary_quiz.rs

@@ -1,4 +1,6 @@
-use crate::data::entities::WordData;
+use crate::app::AppState;
+use crate::data::entities::{EntityHandle, WordData};
+use crate::data::repositories::Repository;
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::RootMessage;
 use crate::navigation::*;
@@ -6,17 +8,18 @@ use crate::pages::dictionary::split_with_coma;
 use crate::pages::dictionary_quiz::DictionaryQuizMessage::*;
 use crate::pages::quiz::Score;
 use crate::styling::*;
-use iced::Background::Color;
+use crate::{jl_button, jl_text_input};
 use iced::border::Radius;
 use iced::widget::container::Style;
-use iced::widget::{Row, button, container, row, space, text, text_input};
-use iced::{Border, Element, Fill, Task, Theme, alignment};
+use iced::widget::{container, row, space, text, Row};
+use iced::Background::Color;
+use iced::{alignment, Border, Element, Fill, Task, Theme};
 use rand::prelude::SliceRandom;
 
-#[derive(Debug, Clone)]
 pub struct DictionaryQuizState {
-    words: Vec<WordData>,
-    current_set: Vec<WordData>,
+    state: AppState,
+    words: Vec<EntityHandle<WordData>>,
+    current_set: Vec<EntityHandle<WordData>>,
     answer: String,
     view: String,
     correct: String,
@@ -73,7 +76,7 @@ impl NavigatedPage<DictionaryQuizMessage> for DictionaryQuizState {
                 ]
                 .align_x(alignment::Horizontal::Center)
                 .spacing(5),
-                text_input("Перевод", &self.answer)
+                jl_text_input!("Перевод", &self.answer)
                     .size(28)
                     .width(250)
                     .on_input(AnswerChanged)
@@ -88,10 +91,7 @@ impl NavigatedPage<DictionaryQuizMessage> for DictionaryQuizState {
                         .size(25),
                 ]
                 .spacing(DEFAULT_SPACING),
-                row![
-                    button("Закончить").style(jl_button).on_press(Back),
-                    self.appeal_button()
-                ]
+                row![jl_button!("Закончить").on_press(Back), self.appeal_button()]
                     .spacing(DEFAULT_SPACING),
             ]
             .spacing(DEFAULT_SPACING)
@@ -104,13 +104,19 @@ impl NavigatedPage<DictionaryQuizMessage> for DictionaryQuizState {
 }
 
 impl DictionaryQuizState {
-    pub fn new(words: Vec<WordData>, reverse: bool, no_typing: bool) -> DictionaryQuizState {
-        DictionaryQuizState {
+    pub fn new(
+        words: Vec<EntityHandle<WordData>>,
+        reverse: bool,
+        no_typing: bool,
+        state: AppState,
+    ) -> DictionaryQuizState {
+        Self {
+            state,
             words,
             current_set: Vec::new(),
-            answer: "".to_string(),
+            answer: String::new(),
             view: "---".to_string(),
-            correct: "".to_string(),
+            correct: String::new(),
             score: Default::default(),
             is_help: false,
             reverse,
@@ -172,7 +178,7 @@ impl DictionaryQuizState {
         self.is_help = false;
         self.answer = String::new();
 
-        let next: WordData = match self.current_set.pop() {
+        let next: EntityHandle<WordData> = match self.current_set.pop() {
             Some(word) => word,
             None => {
                 self.update_set();
@@ -180,12 +186,14 @@ impl DictionaryQuizState {
             }
         };
 
+        let repo = self.state.dictionary.read();
+        let next = repo.get_static(next).unwrap();
         if self.reverse {
-            self.view = next.value.clone();
-            self.correct = next.key.clone();
+            self.view = next.value;
+            self.correct = next.key;
         } else {
-            self.view = next.key.clone();
-            self.correct = next.value.clone();
+            self.view = next.key;
+            self.correct = next.value;
         }
     }
 
@@ -211,7 +219,7 @@ impl DictionaryQuizState {
 
     fn appeal_button(&self) -> Element<'_, DictionaryQuizMessage> {
         if self.is_help && !self.no_typing {
-            return button("Апелляция").style(jl_button).on_press(Appeal).into();
+            return jl_button!("Апелляция").on_press(Appeal).into();
         }
         space().into()
     }

src/pages/exam.rs

@@ -0,0 +1,253 @@
+use crate::app::AppState;
+use crate::data::entities::{CustomField, DeckSettings, EntityHandle, ExamEntry, WordData};
+use crate::data::repositories::Repository;
+use crate::data::Id;
+use crate::navigation::Page::PreviousPage;
+use crate::navigation::{KeyPressedPage, NavigatedPage, Page, RootMessage};
+use crate::pages::exam::ExamMessage::*;
+use crate::pages::repetition::play_sound;
+use crate::styling::*;
+use crate::{push_error, push_error_task};
+use iced::widget::space::horizontal;
+use iced::widget::{button, column, container, progress_bar, row, text, tooltip};
+use iced::{Element, Task};
+use iced_core::keyboard::key::Physical::Code;
+use iced_core::keyboard::Event;
+use iced_core::widget::text::Style;
+use iced_core::Alignment::Center;
+use iced_core::Length::Fill;
+use iced_core::{keyboard, Theme};
+use rand::prelude::SliceRandom;
+use rand::rng;
+use rodio::MixerDeviceSink;
+use std::sync::Arc;
+
+pub struct ExamState {
+    id: Id,
+    state: AppState,
+    entries: Vec<ExamEntry>,
+    total_count: u32,
+    open: bool,
+    custom_fields_cache: Vec<CustomField>,
+    current_word: WordData,
+    current_exam_entry_handle: EntityHandle<ExamEntry>,
+    deck: DeckSettings,
+    can_play: bool,
+    sink: Arc<Option<MixerDeviceSink>>,
+}
+
+#[derive(Clone)]
+pub enum ExamMessage {
+    Back,
+    Open,
+    Answer(bool),
+    Play,
+    PlayFinished,
+}
+
+impl NavigatedPage<ExamMessage> for ExamState {
+    fn navigate(&mut self, message: &ExamMessage) -> Option<Page> {
+        if let Back = message {
+            return Some(PreviousPage);
+        }
+        None
+    }
+
+    fn navigated(&mut self) {}
+
+    fn update(&mut self, message: ExamMessage) -> Task<RootMessage> {
+        match message {
+            Back => {}
+            Open => {
+                if self.open {
+                    return Task::none();
+                }
+
+                self.open = true;
+            }
+            Answer(answer) => {
+                if !self.open {
+                    return Task::none();
+                }
+                let id = self.current_exam_entry_handle.id;
+                let mut repo = self.state.exam_entries.write();
+                repo.set(
+                    &mut self.current_exam_entry_handle,
+                    ExamEntry {
+                        id,
+                        exam_id: self.id,
+                        word_id: self.current_word.id,
+                        status: Some(answer),
+                    },
+                );
+                if let Err(err) = repo.save(&mut self.current_exam_entry_handle) {
+                    return push_error_task!(err);
+                }
+                drop(repo);
+                self.open = false;
+                return self.next();
+            }
+            Play => {
+                if !self.can_play {
+                    return Task::none();
+                }
+
+                self.can_play = false;
+                let value = self.current_word.key.clone();
+                if self.deck.require_speech() {
+                    return Task::perform(play_sound(self.sink.clone(), value), |r| match r {
+                        Ok(_) => RootMessage::Exam(PlayFinished),
+                        Err(err) => push_error!(err),
+                    });
+                }
+            }
+            PlayFinished => {
+                self.can_play = true;
+            }
+        }
+
+        Task::none()
+    }
+
+    fn view(&self) -> Element<'_, ExamMessage> {
+        back_overlay(
+            column![
+                column![
+                    progress_bar(
+                        0.0..=(self.total_count as f32),
+                        (self.total_count - self.entries.len() as u32) as f32
+                    ),
+                    row![
+                        text!("Решено: {}", self.total_count - self.entries.len() as u32),
+                        horizontal().width(Fill),
+                        text!("Осталось: {}", self.entries.len())
+                    ],
+                ],
+                crate::widgets::card_display::word_display(
+                    &self.deck,
+                    &self.current_word,
+                    self.open,
+                    Play,
+                    self.custom_fields_cache.as_slice()
+                ),
+                container(self.answer_bar())
+                    .width(Fill)
+                    .align_x(Center)
+                    .height(80),
+            ]
+            .into(),
+            Back,
+        )
+    }
+}
+
+impl ExamState {
+    fn answer_bar(&self) -> Element<'_, ExamMessage> {
+        if !self.open {
+            return text!("Нажмите Пробел для открытия карточки")
+                .style(|theme: &Theme| Style {
+                    color: Some(theme.palette().text.scale_alpha(0.3)),
+                })
+                .into();
+        }
+
+        row![
+            tooltip(
+                button("Не знаю").on_press(Answer(false)),
+                "Клавиша 1",
+                tooltip::Position::Top
+            ),
+            tooltip(
+                button("Знаю").on_press(Answer(true)),
+                "Клавиша 2",
+                tooltip::Position::Top
+            ),
+        ]
+        .spacing(QUARTER_SPACING)
+        .into()
+    }
+}
+
+impl ExamState {
+    pub fn new(exam_id: Id, deck: DeckSettings, state: &AppState) -> Self {
+        let custom_fields_cache = state.custom_fields.read().iter().cloned().collect();
+        let sink_handle = if deck.require_speech() {
+            rodio::DeviceSinkBuilder::open_default_sink().ok()
+        } else {
+            None
+        };
+
+        let mut entries: Vec<_> = state
+            .exam_entries
+            .read()
+            .iter()
+            .filter(|e| e.exam_id == exam_id)
+            .cloned()
+            .collect();
+        let total_count = entries.len() as u32;
+        entries.retain(|e| e.status.is_none());
+        entries.shuffle(&mut rng());
+        let word = state
+            .dictionary
+            .read()
+            .get_static(EntityHandle::from_id(entries.last().unwrap().word_id))
+            .unwrap();
+        Self {
+            id: exam_id,
+            state: state.clone(),
+            current_word: word,
+            current_exam_entry_handle: EntityHandle::from_id(entries.last().unwrap().id),
+            entries,
+            total_count,
+            open: false,
+            custom_fields_cache,
+            deck,
+            can_play: true,
+            sink: Arc::new(sink_handle),
+        }
+    }
+
+    fn next(&mut self) -> Task<RootMessage> {
+        self.entries.pop().unwrap();
+        if self.entries.is_empty() {
+            return Task::done(RootMessage::Exam(Back));
+        }
+
+        let entry = self.entries.last().unwrap();
+        let handle: EntityHandle<ExamEntry> = EntityHandle::from_id(entry.id);
+        let word = self
+            .state
+            .dictionary
+            .read()
+            .get_static(EntityHandle::from_id(entry.word_id))
+            .unwrap();
+        self.current_word = word;
+        self.current_exam_entry_handle = handle;
+        Task::none()
+    }
+}
+
+impl KeyPressedPage for ExamState {
+    fn press(&mut self, message: &Event) -> Task<RootMessage> {
+        if let Event::KeyPressed {
+            key: _,
+            modified_key: _,
+            physical_key: pk,
+            location: _,
+            modifiers: _,
+            text: _,
+            repeat: _,
+        } = message
+            && let Code(code) = pk
+        {
+            return match code {
+                keyboard::key::Code::Space => Task::done(RootMessage::Exam(Open)),
+                keyboard::key::Code::Digit1 => Task::done(RootMessage::Exam(Answer(false))),
+                keyboard::key::Code::Digit2 => Task::done(RootMessage::Exam(Answer(true))),
+                _ => Task::none(),
+            };
+        }
+
+        Task::none()
+    }
+}

src/pages/exams.rs

@@ -0,0 +1,440 @@
+use crate::app::AppState;
+use crate::data::entities::{DeckSettings, EntityHandle, Exam, ExamEntry, WordData};
+use crate::data::repositories::{BatchedRepository, Repository};
+use crate::data::Id;
+use crate::navigation::Page::PreviousPage;
+use crate::navigation::{NavigatedPage, Page, RootMessage};
+use crate::notification::MaybeError;
+use crate::pages::exam::ExamState;
+use crate::pages::exams::ExamsMessage::*;
+use crate::pages::repetitions::Style;
+use crate::push_error;
+use crate::styling::{
+    back_overlay, cta_button, BUTTON_RADIUS, DEFAULT_SPACING, HALF_SPACING, QUARTER_SPACING,
+};
+use crate::{jl_button, push_error_task};
+use chrono::{Local, Utc};
+use iced::widget::button::Status;
+use iced::widget::container::bordered_box;
+use iced::widget::space::horizontal;
+use iced::widget::{
+    button, center_x, column, container, row, rule, scrollable, space, text, tooltip,
+    Column,
+};
+use iced::{Element, Task};
+use iced_core::Alignment::*;
+use iced_core::Length::{Fill, FillPortion};
+use iced_core::{Background, Border, Color, Shadow, Theme};
+use std::collections::BTreeMap;
+use std::ops::{Deref, DerefMut};
+use std::sync::Arc;
+
+pub struct ExamsState {
+    state: AppState,
+    deck_id: EntityHandle<DeckSettings>,
+    deck: DeckSettings,
+    selected_exam_id: Option<EntityHandle<Exam>>,
+    exams: BTreeMap<EntityHandle<Exam>, ExamExtended>,
+}
+
+#[derive(Clone, Eq, PartialEq)]
+pub enum ExamsMessage {
+    Back,
+    SelectExam(EntityHandle<Exam>),
+    CreateExam,
+    GotoExam,
+}
+
+impl NavigatedPage<ExamsMessage> for ExamsState {
+    fn navigate(&mut self, message: &ExamsMessage) -> Option<Page> {
+        if let Back = message {
+            return Some(PreviousPage);
+        }
+        if let Some(selected_exam_id) = self.selected_exam_id
+            && GotoExam == *message
+        {
+            return Some(Page::Exam(ExamState::new(
+                selected_exam_id.id,
+                self.deck.clone(),
+                &self.state,
+            )));
+        }
+        None
+    }
+
+    fn navigated(&mut self) {
+        self.exams = Self::get_exams_list(&self.state, self.deck_id.id);
+    }
+
+    fn update(&mut self, message: ExamsMessage) -> Task<RootMessage> {
+        match message {
+            Back => {}
+            GotoExam => {}
+            SelectExam(id) => {
+                self.selected_exam_id = Some(id);
+            }
+            CreateExam => {
+                let exam = Exam {
+                    id: Default::default(),
+                    timestamp: Utc::now(),
+                    deck_id: self.deck_id.id,
+                };
+                let mut exam_repo = self.state.exam.write();
+                let handle = exam_repo.create_now(exam);
+                if let Ok(handle) = handle {
+                    drop(exam_repo);
+                    if let Err(err) = self.append_exam_entries(handle) {
+                        return push_error_task!(err);
+                    }
+                    self.exams = Self::get_exams_list(&self.state, self.deck_id.id);
+                    self.selected_exam_id = Some(handle);
+                } else {
+                    return push_error_task!(handle.err().unwrap());
+                }
+            }
+        }
+
+        Task::none()
+    }
+
+    fn view(&self) -> Element<'_, ExamsMessage> {
+        back_overlay(
+            column![
+                text(format!("Экзамены для колоды {}", self.deck.name)),
+                row![
+                    column![
+                        scrollable(self.exams_list()).height(Fill),
+                        jl_button!("Добавить").width(Fill).on_press(CreateExam),
+                    ]
+                    .spacing(DEFAULT_SPACING)
+                    .width(FillPortion(1)),
+                    self.selected_exam_view(),
+                ].spacing(DEFAULT_SPACING)
+            ]
+            .into(),
+            Back,
+        )
+    }
+}
+
+impl ExamsState {
+    pub fn new(deck_id: EntityHandle<DeckSettings>, state: AppState) -> Self {
+        let deck = state.decks.read().get_static(deck_id).unwrap();
+
+        Self {
+            exams: Self::get_exams_list(&state, deck_id.id),
+            state,
+            deck_id,
+            deck,
+            selected_exam_id: None,
+        }
+    }
+
+    fn selected_exam(&self) -> Option<&ExamExtended> {
+        self.exams.get(&self.selected_exam_id?)
+    }
+
+    fn append_exam_entries(&mut self, handle: EntityHandle<Exam>) -> MaybeError {
+        let deck_id = self.deck_id.id;
+        let words: Vec<_> = self
+            .state
+            .card_states
+            .read()
+            .iter()
+            .filter(|state| state.deck_id == deck_id)
+            .map(|state| state.word_id)
+            .collect();
+        let mut entries = words
+            .iter()
+            .map(|word_id| ExamEntry {
+                id: Default::default(),
+                exam_id: handle.id,
+                word_id: *word_id,
+                status: None,
+            })
+            .collect::<Vec<_>>();
+
+        self.state
+            .exam_entries
+            .write()
+            .create_now_many(entries.as_mut_slice())?;
+
+        Ok(())
+    }
+
+    fn get_exams_list(state: &AppState, deck_id: Id) -> BTreeMap<EntityHandle<Exam>, ExamExtended> {
+        let mut query = state
+            .exam
+            .read()
+            .query(Arc::new(move |exam| exam.deck_id == deck_id));
+        let handles: Vec<_> = query.handles().collect();
+        query
+            .iter(&state.exam.read())
+            .cloned()
+            .zip(handles)
+            .map(|(e, h)| (h, ExamExtended::from(e, state)))
+            .collect()
+    }
+}
+
+impl ExamsState {
+    pub fn exams_list(&self) -> Column<'_, ExamsMessage> {
+        let mut column = Column::new();
+
+        for (handle, deck) in self.exams.iter() {
+            column = column.push(
+                jl_button!(text!(
+                    "{}",
+                    &deck
+                        .timestamp
+                        .with_timezone(&Local)
+                        .format("%d/%m/%Y %H:%M")
+                ))
+                .on_press_with(move || SelectExam(*handle))
+                .style(move |_x: &Theme, status: Status| Style {
+                    background: if status == Status::Hovered {
+                        Some(Background::Color(Color::WHITE.scale_alpha(0.2)))
+                    } else {
+                        None
+                    },
+                    text_color: if deck.finished() {
+                        _x.palette().success
+                    } else {
+                        _x.palette().primary
+                    },
+                    border: Border {
+                        color: Default::default(),
+                        width: 0.0,
+                        radius: BUTTON_RADIUS.into(),
+                    },
+                    shadow: Shadow::default(),
+                    snap: false,
+                }),
+            );
+        }
+
+        column
+    }
+    pub fn selected_exam_view(&self) -> Element<'_, ExamsMessage> {
+        if let Some(exam) = self.selected_exam() {
+            return column![
+                center_x(text!(
+                    "Экзамен от {}",
+                    exam.timestamp
+                        .with_timezone(&Local)
+                        .format("%d/%m/%Y %H:%M")
+                )),
+                row![text!("{} карточек", exam.total), Self::exam_bar(exam)]
+                    .height(30)
+                    .align_y(Center)
+                    .width(Fill)
+                    .spacing(HALF_SPACING),
+                rule::horizontal(2),
+                self.exam_variable_view(exam),
+            ]
+            .spacing(DEFAULT_SPACING)
+            .width(FillPortion(2))
+            .into();
+        }
+
+        space().width(FillPortion(3)).into()
+    }
+
+    fn exam_bar(exam: &ExamExtended) -> Element<'_, ExamsMessage> {
+        let total = 1000.0;
+        let answered = (exam.answered as f64 / exam.total as f64 * total).round();
+        let unknown = (exam.unknown as f64 / exam.total as f64 * total).round();
+        let remaining = (exam.remaining() as f64 / exam.total as f64 * total).round();
+        let mut row = row![];
+        if answered > 0.0 {
+            row = row.push(tooltip(
+                container(space())
+                    .height(Fill)
+                    .width(FillPortion(answered as u16))
+                    .style(|theme: &Theme| container::Style {
+                        background: Some(Background::Color(theme.palette().success)),
+                        text_color: Default::default(),
+                        border: Default::default(),
+                        shadow: Default::default(),
+                        snap: false,
+                    }),
+                text!("Правильно: {}% ({})", answered / 10.0, exam.answered),
+                tooltip::Position::Bottom,
+            ));
+        }
+        if unknown > 0.0 {
+            row = row.push(tooltip(
+                container(space())
+                    .height(Fill)
+                    .width(FillPortion(unknown as u16))
+                    .style(|theme: &Theme| container::Style {
+                        background: Some(Background::Color(theme.palette().danger)),
+                        text_color: Default::default(),
+                        border: Default::default(),
+                        shadow: Default::default(),
+                        snap: false,
+                    }),
+                text!("Не получилось: {}% ({})", unknown / 10.0, exam.unknown),
+                tooltip::Position::Bottom,
+            ));
+        }
+        if remaining > 0.0 {
+            row = row.push(tooltip(
+                container(space())
+                    .height(Fill)
+                    .width(FillPortion(remaining as u16))
+                    .style(|theme: &Theme| container::Style {
+                        background: Some(Background::Color(theme.palette().primary)),
+                        text_color: Default::default(),
+                        border: Default::default(),
+                        shadow: Default::default(),
+                        snap: false,
+                    }),
+                text!("Осталось {}% ({})", remaining / 10.0, exam.remaining()),
+                tooltip::Position::Bottom,
+            ));
+        }
+
+        row.width(Fill).height(Fill).into()
+    }
+
+    fn exam_variable_view(&self, exam: &ExamExtended) -> Element<'_, ExamsMessage> {
+        if exam.finished() {
+            self.exam_finished_view(exam)
+        } else {
+            self.exam_ongoing_view(exam)
+        }
+    }
+
+    fn exam_finished_view(&self, exam: &ExamExtended) -> Element<'_, ExamsMessage> {
+        let result = (exam.answered as f64 / exam.total as f64 * 1000.0).round() / 10.0;
+        let words_repo = self.state.dictionary.read();
+        column![
+            center_x(text!("Итоговый результат: {}%", result).size(28)),
+            row![
+                Self::words_list(
+                    "Правильно",
+                    exam.answered_list
+                        .iter()
+                        .map(|handle| words_repo.get_ref_static(*handle).unwrap())
+                        .collect::<Vec<_>>()
+                        .as_slice()
+                )
+                .width(Fill),
+                Self::words_list(
+                    "Не получилось",
+                    exam.unknows_list
+                        .iter()
+                        .map(|handle| words_repo.get_ref_static(*handle).unwrap())
+                        .collect::<Vec<_>>()
+                        .as_slice()
+                )
+                .width(Fill)
+            ]
+            .width(Fill)
+            .spacing(QUARTER_SPACING)
+        ]
+        .spacing(DEFAULT_SPACING)
+        .into()
+    }
+
+    fn exam_ongoing_view(&self, _: &ExamExtended) -> Element<'_, ExamsMessage> {
+        center_x(
+            button("Продолжить экзамен")
+                .style(cta_button)
+                .on_press(GotoExam),
+        )
+        .into()
+    }
+
+    fn words_list<'a>(name: &str, words: &[&WordData]) -> Column<'a, ExamsMessage> {
+        let mut column = column![];
+        for word in words {
+            let container = container(
+                column![text!("{}", word.key), text!("{}", word.value)].padding(QUARTER_SPACING),
+            )
+            .width(Fill)
+            .style(bordered_box);
+            column = column.push(container);
+        }
+        column![
+            text!("{}", name),
+            scrollable(row![
+                column.spacing(QUARTER_SPACING),
+                horizontal().width(DEFAULT_SPACING)
+            ])
+        ]
+        .align_x(Center)
+    }
+}
+
+struct ExamExtended {
+    exam: Exam,
+    total: u32,
+    answered: u32,
+    unknown: u32,
+    answered_list: Vec<EntityHandle<WordData>>,
+    unknows_list: Vec<EntityHandle<WordData>>,
+}
+
+impl ExamExtended {
+    fn from(exam: Exam, state: &AppState) -> Self {
+        let entries = state.exam_entries.read();
+        let mut total = 0;
+        let mut answered = 0;
+        let mut unknown = 0;
+        let mut answered_list = Vec::with_capacity(128);
+        let mut unknows_list = Vec::with_capacity(128);
+        entries
+            .iter()
+            .filter(|e| e.exam_id == exam.id)
+            .for_each(|e| {
+                total += 1;
+                match e.status {
+                    None => {}
+                    Some(s) => {
+                        if s {
+                            answered += 1;
+                            answered_list.push(EntityHandle::from_id(e.word_id));
+                        } else {
+                            unknown += 1;
+                            unknows_list.push(EntityHandle::from_id(e.word_id));
+                        }
+                    }
+                }
+            });
+
+        Self {
+            exam,
+            total,
+            answered,
+            unknown,
+            answered_list,
+            unknows_list,
+        }
+    }
+    fn solved(&self) -> u32 {
+        self.answered + self.unknown
+    }
+
+    fn finished(&self) -> bool {
+        self.solved() == self.total
+    }
+
+    fn remaining(&self) -> u32 {
+        self.total - self.solved()
+    }
+}
+
+impl Deref for ExamExtended {
+    type Target = Exam;
+    fn deref(&self) -> &Self::Target {
+        &self.exam
+    }
+}
+
+impl DerefMut for ExamExtended {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.exam
+    }
+}

src/pages/history.rs

@@ -1,7 +1,6 @@
 use crate::app::AppState;
-use crate::data::INVALID_ID;
-use crate::data::entities::{HistoryItem, WordData};
-use crate::data_provider::history::get_history_of_set;
+use crate::data::entities::{HistoryNote, WordData};
+use crate::data::repositories::Repository;
 use crate::navigation::*;
 use crate::styling::*;
 use HistoryMessage::Back;
@@ -10,13 +9,10 @@ use iced::alignment::Horizontal::Center;
 use iced::widget::space::horizontal;
 use iced::widget::*;
 use iced::{Element, Fill, FillPortion, Task};
-use parking_lot::Mutex;
 use std::sync::Arc;
 
-#[derive(Clone)]
 pub struct HistoryState {
-    list: Vec<HistoryItem>,
-    words: Vec<WordData>,
+    list: Vec<(WordData, HistoryNote)>,
 }
 
 impl NavigatedPage<HistoryMessage> for HistoryState {
@@ -48,51 +44,49 @@ impl NavigatedPage<HistoryMessage> for HistoryState {
 }
 
 impl HistoryState {
-    pub fn new(id: crate::data::Id, state: Arc<Mutex<AppState>>) -> Self {
-        let state = state.lock();
-        let history = get_history_of_set(id).unwrap_or_default();
-        let words = history
-            .iter()
-            .map(
-                |item| match state.dictionary.iter().find(|w| w.id == item.word_id) {
-                    None => WordData {
-                        id,
+    pub fn new(id: crate::data::Id, state: AppState) -> Self {
+        let dict = &state.dictionary.read();
+        let history_repo = &mut state.history.write();
+        history_repo.init().expect("TODO: panic message");
+        let mut history = history_repo.query(Arc::new(move |h| h.deck_id == id));
+        let mut words: Vec<_> = history
+            .iter(history_repo)
+            .map(|item| {
+                let handle = dict.handle_by_id(item.word_id);
+                let word = dict.get_static(handle).unwrap_or(WordData {
+                    id: Default::default(),
+                    group_id: Default::default(),
                     key: "Удаленное слово".to_string(),
-                        value: "Удаленное слово".to_string(),
-                        tags: "Удаленное слово".to_string(),
+                    value: String::new(),
+                    tags: String::new(),
                     additional: Default::default(),
-                        group_id: INVALID_ID,
-                    },
-                    Some(word) => word.clone(),
-                },
-            )
+                });
+                (word, item.clone())
+            })
             .collect();
-
-        Self {
-            list: history,
-            words,
-        }
+        words.reverse();
+        Self { list: words }
     }
 
     fn history_lines(&self) -> Column<'_, HistoryMessage> {
         let mut column = Column::new();
-        for (index, item) in self.list.iter().enumerate() {
+        for (index, item) in &self.list {
+            let activity = item;
             column = column.push(
                 row![
                     iced::widget::column![
-                        text!("{}", self.words[index].key)
-                            .width(Fill)
-                            .align_x(Center),
-                        text!("{}", self.words[index].value)
-                            .width(Fill)
-                            .align_x(Center),
+                        text!("{}", index.key).width(Fill).align_x(Center),
+                        text!("{}", index.value).width(Fill).align_x(Center),
                     ]
                     .align_x(Center),
                     iced::widget::column![
-                        text!("{} ➞ {}", item.before, item.after),
+                        text!("{} ➞ {}", activity.before, activity.after),
                         text!(
                             "{}",
-                            item.timestamp.with_timezone(&Local).format("%d.%m %H:%M")
+                            activity
+                                .timestamp
+                                .with_timezone(&Local)
+                                .format("%d.%m %H:%M")
                         )
                     ]
                     .spacing(5)

src/pages/import.rs

@@ -1,18 +1,21 @@
 use crate::app::AppState;
-use crate::data::entities::{WordData, WordGroup};
+use crate::data::Id;
+use crate::data::entities::WordGroup;
+use crate::data::entities::{CustomField, WordData};
+use crate::data::repositories::{BatchedRepository, Repository};
 use crate::data_provider::import::{ImportData, ImportGroup, get_words_of_group, load_groups};
-use crate::data_provider::words::{add_group, add_words};
 use crate::fs::*;
 use crate::navigation::{NavigatedPage, Page, RootMessage};
-use crate::notification::NotificationData::OpenFileError;
+use crate::notification::NotificationData::{CompressError, OpenFileError};
 use crate::notification::{MaybeError, NotificationData};
 use crate::pages::import::ImportMessage::*;
-use crate::push_error;
 use crate::styling::*;
+use crate::{jl_button, push_error_task};
+use crate::{jl_text_input, push_error};
 use iced::widget::button::danger;
 use iced::widget::container::success;
 use iced::widget::{
-    Row, button, checkbox, column, container, progress_bar, row, rule, text, text_input,
+    Row, button, checkbox, column, container, progress_bar, row, rule, text,
 };
 use iced::widget::{scrollable, space};
 use iced::{Element, Task};
@@ -23,18 +26,19 @@ use log::info;
 use parking_lot::Mutex;
 use rfd::AsyncFileDialog;
 use rusqlite::Connection;
+use std::collections::HashMap;
 use std::fs::{File, OpenOptions};
 use std::io::BufReader;
 use std::path::PathBuf;
 use std::sync::Arc;
 use tokio::task::spawn_blocking;
 use zip::ZipArchive;
+use zstd::Decoder;
 
 const DEFAULT_FIELDS: [&str; 6] = ["key", "value", "tags", "reading", "context", "description"];
 
-#[derive(Clone)]
 pub struct ImportState {
-    state: Arc<Mutex<AppState>>,
+    state: AppState,
     path: Option<PathBuf>,
     import_data: Option<ImportData>,
     selected_index: usize,
@@ -153,7 +157,7 @@ impl NavigatedPage<ImportMessage> for ImportState {
                     scrollable(
                         column![
                             row![
-                                button("Выбрать файл").style(jl_button).on_press(SelectFile),
+                                jl_button!("Выбрать файл").on_press(SelectFile),
                                 text!("{}", {
                                     if let Some(path) = &self.path {
                                         path.to_string_lossy().to_string()
@@ -265,7 +269,7 @@ impl ImportState {
             self.available_properties(),
             button("Добавить напрямую").on_press(SetupDirect),
             row![
-                text_input("Пользовательское поле", &self.custom_property_name)
+                jl_text_input!("Пользовательское поле", &self.custom_property_name)
                     .on_input(EditCustomProperty),
                 button("Установить привязку").on_press(SetupCustomProperty)
             ]
@@ -293,7 +297,7 @@ impl ImportState {
                 .on_toggle(SwitchSkipEmpty),
             column![
                 text!("Разделитель при множественном объединении"),
-                text_input("", &self.separator).on_input(EditSeparator)
+                jl_text_input!("", &self.separator).on_input(EditSeparator)
             ]
         ]
         .spacing(DEFAULT_SPACING)
@@ -318,14 +322,14 @@ impl ImportState {
 }
 
 impl ImportState {
-    pub fn new(state: Arc<Mutex<AppState>>) -> ImportState {
+    pub fn new(state: AppState) -> ImportState {
         ImportState {
             state,
             path: None,
             import_data: None,
             selected_index: 0,
             selected_property: None,
-            custom_property_name: "".to_string(),
+            custom_property_name: String::new(),
             skip_empty: true,
             separator: ", ".to_string(),
             progress: None,
@@ -359,8 +363,8 @@ impl ImportState {
         Task::perform(
             async {
                 spawn_blocking(move || {
-                    Self::extract_import_file(path)?;
-                    let data = Self::read_import_file()?;
+                    let schema = Self::extract_import_file(path)?;
+                    let data = Self::read_import_file(schema)?;
                     Ok(data)
                 })
                 .await
@@ -373,7 +377,7 @@ impl ImportState {
         )
     }
 
-    fn extract_import_file(path: PathBuf) -> MaybeError {
+    fn extract_import_file(path: PathBuf) -> Result<AnkiSchema, NotificationData> {
         let file = File::open(path).map_err(|_| OpenFileError)?;
         let reader = BufReader::new(file);
         let mut archive = ZipArchive::new(reader).map_err(|_| OpenFileError)?;
@@ -384,20 +388,24 @@ impl ImportState {
             .truncate(true)
             .open(&temp_file_path)
             .map_err(|_| OpenFileError)?;
-        if let Ok(mut file) = archive.by_name("collection.anki21") {
+        if let Ok(mut file) = archive.by_name("collection.anki21b") {
+            let mut decoder = Decoder::new(&mut file).map_err(|_| CompressError)?;
+            std::io::copy(&mut decoder, &mut temp_file).map_err(|_| OpenFileError)?;
+            Ok(AnkiSchema::Beta)
+        } else if let Ok(mut file) = archive.by_name("collection.anki21") {
             std::io::copy(&mut file, &mut temp_file).map_err(|_| OpenFileError)?;
-            Ok(())
+            Ok(AnkiSchema::Old)
         } else if let Ok(mut file) = archive.by_name("collection.anki2") {
             std::io::copy(&mut file, &mut temp_file).map_err(|_| OpenFileError)?;
-            Ok(())
+            Ok(AnkiSchema::Old)
         } else {
             Err(OpenFileError)
         }
     }
-    fn read_import_file() -> Result<ImportData, NotificationData> {
+    fn read_import_file(schema: AnkiSchema) -> Result<ImportData, NotificationData> {
         let temp_file_path = temp_import_path();
         let connection = Connection::open(&temp_file_path).map_err(|_| OpenFileError)?;
-        let data = load_groups(&connection)?;
+        let data = load_groups(&connection, schema)?;
         Ok(data)
     }
     fn setup_mapping(&mut self, property_name: String) {
@@ -427,7 +435,19 @@ impl ImportState {
         let separator = self.separator.clone();
         let skip_empty = self.skip_empty;
         let group = self.import_data.as_ref().unwrap().0[self.selected_index].clone();
+        let map_indices = Self::get_mapping_indices(&group);
         let progress = self.progress.clone().unwrap();
+        if let Err(err) = Self::ensure_fields(&state, &map_indices) {
+            return push_error_task!(err);
+        }
+        let fields: HashMap<String, Id> = HashMap::from_iter(
+            state
+                .custom_fields
+                .read()
+                .iter()
+                .map(|f| (f.identifier.clone(), f.id)),
+        );
+
         info!("{}", group.name);
         Task::perform(
             async move {
@@ -438,17 +458,17 @@ impl ImportState {
                     let import_list = get_words_of_group(&connection, group.id)?;
                     let mut words_list = Vec::with_capacity(import_list.len());
 
-                    let map_indices = Self::get_mapping_indices(&group);
-                    let mut group_entity = WordGroup {
+                    let group_handle;
+                    {
+                        let group_entity = WordGroup {
                             id: 0.into(),
                             name: group.name.clone(),
                         };
-                    {
-                        let state = state.lock();
-                        add_group(&mut group_entity, &state.connection)?;
+                        let mut groups_repo = state.word_groups.write();
+                        group_handle = groups_repo.create_now(group_entity)?;
                     }
 
-                    let group_id = group_entity.id;
+                    let group_id = group_handle.id;
                     for import in import_list {
                         let mut word = WordData::new();
 
@@ -472,7 +492,7 @@ impl ImportState {
                                     word.tags = collected_string;
                                 }
                                 &_ => {
-                                    word.additional.insert((*dest).clone(), collected_string);
+                                    word.additional.insert(fields[dest], collected_string);
                                 }
                             }
                         }
@@ -480,20 +500,16 @@ impl ImportState {
                         words_list.push(word);
                     }
 
-                    let mut state = state.lock();
-                    let connection = &mut state.connection;
+                    let mut words_repo = state.dictionary.write();
                     let mut index = 0;
                     let total_len = words_list.len() as f32 / 1024.0;
-                    for word in &mut words_list.chunks_mut(1024) {
-                        add_words(word, connection)?;
+                    for words in &mut words_list.chunks_mut(1024) {
+                        words_repo.create_now_many(words)?;
                         index += 1;
                         let mut progress = progress.lock();
                         *progress = (index as f32 / total_len).min(1.0);
                     }
 
-                    state.dictionary.append(&mut words_list);
-                    state.word_groups.push(group_entity);
-
                     Ok(())
                 })
                 .await
@@ -556,4 +572,38 @@ impl ImportState {
             |_| RootMessage::Import(NextProgress),
         )
     }
+
+    fn ensure_fields(
+        state: &AppState,
+        import_group: &Vec<(String, Vec<usize>)>,
+    ) -> Result<(), NotificationData> {
+        let mut fields_repo = state.custom_fields.write();
+        let mut current_fields: Vec<String> = fields_repo
+            .iter()
+            .map(|field| field.identifier.clone())
+            .collect();
+        current_fields.append(&mut vec![
+            "key".to_string(),
+            "value".to_string(),
+            "tags".to_string(),
+        ]);
+        for (field, _) in import_group {
+            if current_fields.contains(field) {
+                continue;
+            }
+
+            fields_repo.create_now(CustomField {
+                id: Default::default(),
+                name: field.clone(),
+                identifier: field.clone(),
+            })?;
+        }
+
+        Ok(())
+    }
+}
+
+pub enum AnkiSchema {
+    Old,
+    Beta,
 }

src/pages/quiz.rs

@@ -4,11 +4,11 @@ use crate::navigation::Page::PreviousPage;
 use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::pages::quiz::QuizMessage::*;
 use crate::styling::*;
+use crate::{jl_button, jl_text_input};
 use iced::widget::*;
 use iced::{Element, Fill, Task, alignment};
 use rand::seq::SliceRandom;
 
-#[derive(Clone, Debug)]
 pub struct QuizState {
     kana: String,
     current_roman: String,
@@ -77,12 +77,12 @@ impl NavigatedPage<QuizMessage> for QuizState {
                 ]
                 .align_y(alignment::Vertical::Center)
                 .spacing(20),
-                text_input("Романдзи", &self.current_roman)
+                jl_text_input!("Романдзи", &self.current_roman)
                     .size(28)
                     .width(150)
                     .on_input(ContentChanged),
                 score_display(&self.score),
-                button("Закончить").style(jl_button).on_press(Back),
+                jl_button!("Закончить").on_press(Back),
             ]
             .spacing(DEFAULT_SPACING)
             .align_x(alignment::Horizontal::Center),
@@ -113,7 +113,7 @@ impl QuizState {
             kana: "ぁ".to_string(),
             correct_roman: "a".to_string(),
             is_help: false,
-            current_roman: "".to_string(),
+            current_roman: String::new(),
             set: KanaSet::hiragana(),
             queue: Vec::new(),
             score: Score {

src/pages/randomizer.rs

@@ -1,12 +1,12 @@
+use crate::jl_button;
 use crate::navigation::RootMessage;
 use crate::navigation::{NavigatedPage, Page};
 use crate::pages::randomizer::RandomizerMessage::{Back, Edit, Start};
-use crate::styling::{HALF_SPACING, back_overlay, jl_button};
+use crate::styling::{HALF_SPACING, back_overlay};
 use iced::Task;
-use iced::widget::{button, text_editor};
+use iced::widget::text_editor;
 use rand::prelude::SliceRandom;
 
-#[derive(Clone, Debug)]
 pub struct RandomizerState {
     text: text_editor::Content,
     list: Vec<String>,
@@ -56,7 +56,7 @@ impl NavigatedPage<RandomizerMessage> for RandomizerState {
                     .width(400)
                     .height(400)
                     .placeholder("Каждый элемент с новой строки"),
-                button("Перемешать").style(jl_button).on_press(Start),
+                jl_button!("Перемешать").on_press(Start),
             ]
             .spacing(HALF_SPACING)
             .into(),

src/pages/repetition.rs

@@ -1,36 +1,38 @@
 use crate::app::AppState;
 use crate::core::deck::DeckData;
 use crate::core::srs::WordOpenMode;
+use crate::data::entities::{CardState, CustomField, WordData};
+use crate::data::repositories::Repository;
 use crate::data::Id;
-use crate::data::entities::{CardStatistics, DeckSettings, WordData};
 use crate::data_provider::voice::get_voice;
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::{KeyPressedPage, NavigatedPage, Page, RootMessage};
 use crate::notification::{MaybeError, NotificationData};
+use crate::pages::repetition::RepetitionMessage::Play;
+use crate::pages::repetitions::DeckRunData;
 use crate::styling::*;
 use crate::{push_error, push_error_task};
-use chrono::Local;
 use iced::alignment::Horizontal::Center;
 use iced::keyboard::key::Physical::Code;
 use iced::widget::text::Style;
-use iced::widget::{Column, button, column, container, row, rule, space, text, tooltip};
-use iced::{Element, Fill, Task, Theme, alignment, keyboard};
-use parking_lot::Mutex;
+use iced::widget::{button, column, container, row, text, tooltip};
+use iced::{keyboard, Element, Fill, Task, Theme};
 use rodio::MixerDeviceSink;
 use std::collections::HashSet;
 use std::sync::Arc;
 use tokio::task::spawn_blocking;
 
 pub struct RepetitionState {
-    state: Arc<Mutex<AppState>>,
-    pub settings: DeckSettings,
+    state: AppState,
+    pub settings: DeckRunData,
     pub set: DeckData,
     current_word: WordData,
-    current_statistic: CardStatistics,
+    current_statistic: CardState,
     open: bool,
     can_play: bool,
     sink: Arc<Option<MixerDeviceSink>>,
     opened: HashSet<Id>,
+    custom_fields_cache: Vec<CustomField>,
 }
 
 impl NavigatedPage<RepetitionMessage> for RepetitionState {
@@ -48,7 +50,7 @@ impl NavigatedPage<RepetitionMessage> for RepetitionState {
             RepetitionMessage::Back => {}
             RepetitionMessage::Next => return self.next(),
             RepetitionMessage::Answer(m) => return self.answer(m),
-            RepetitionMessage::Play => {
+            Play => {
                 if !self.can_play {
                     return Task::none();
                 }
@@ -72,17 +74,7 @@ impl NavigatedPage<RepetitionMessage> for RepetitionState {
     fn view(&self) -> Element<'_, RepetitionMessage> {
         back_overlay(
             column![
-                container(self.draw_forward())
-                    .width(Fill)
-                    .height(Fill)
-                    .align_x(Center)
-                    .align_y(alignment::Vertical::Center),
-                rule::horizontal(2),
-                container(self.draw_backward())
-                    .width(Fill)
-                    .height(Fill)
-                    .align_x(Center)
-                    .align_y(alignment::Vertical::Center),
+                crate::widgets::card_display::word_display(&self.settings.general_settings, &self.current_word, self.open, Play, self.custom_fields_cache.as_slice()),
                 container(self.answer_bar())
                     .width(Fill)
                     .align_x(Center)
@@ -91,7 +83,7 @@ impl NavigatedPage<RepetitionMessage> for RepetitionState {
                     "Затронуто слов {}, {}%",
                     self.opened.len(),
                     (self.opened.len() as f32 / self.set.len() as f32 * 10000.0).round() / 100.0
-                )
+                ),
             ]
             .height(Fill)
             .width(Fill)
@@ -103,18 +95,21 @@ impl NavigatedPage<RepetitionMessage> for RepetitionState {
 
 impl RepetitionState {
     pub(crate) fn new(
-        set: DeckSettings,
-        state: Arc<Mutex<AppState>>,
+        set: DeckRunData,
+        state: AppState,
     ) -> Result<RepetitionState, NotificationData> {
-        let mut card_set = DeckData::new(&set, state.clone())?;
+        let mut card_set = DeckData::new(&set, set.open_mode, state.clone());
         let (word, stat) = card_set.next();
-
+        let word = state.dictionary.read().get_static(word).unwrap();
+        let stat = state.card_states.read().get_static(stat).unwrap();
         let sink_handle = if set.forward.contains("speech") || set.backward.contains("speech") {
             rodio::DeviceSinkBuilder::open_default_sink().ok()
         } else {
             None
         };
 
+        let custom_fields_cache = state.custom_fields.read().iter().cloned().collect();
+
         Ok(RepetitionState {
             state,
             settings: set,
@@ -125,6 +120,7 @@ impl RepetitionState {
             can_play: true,
             sink: Arc::new(sink_handle),
             opened: HashSet::new(),
+            custom_fields_cache,
         })
     }
 }
@@ -150,9 +146,11 @@ impl RepetitionState {
 
         self.open = false;
         self.opened.insert(self.current_word.id);
-        let next = self.set.next();
-        self.current_word = next.0;
-        self.current_statistic = next.1;
+        let (word, state) = self.set.next();
+        let word = self.state.dictionary.read().get_static(word).unwrap();
+        let stat = self.state.card_states.read().get_static(state).unwrap();
+        self.current_word = word;
+        self.current_statistic = stat;
 
         if self.settings.require_speech() && self.sink.is_some() {
             let sink = self.sink.clone();
@@ -162,66 +160,9 @@ impl RepetitionState {
                 Err(err) => push_error!(err),
             });
         }
-        self.increment_counter();
         Task::none()
     }
 
-    fn increment_counter(&mut self) {
-        let mut state = self.state.lock();
-        let id = self.settings.id;
-        let activity = state.activity.get_mut(&id);
-
-        let now = Local::now().date_naive();
-
-        if let Some(activity) = activity {
-            let (last_day, counter) = activity.last_mut().unwrap();
-            if *last_day == now {
-                *counter += 1;
-            } else {
-                activity.push((now, 1));
-            }
-        } else {
-            state.activity.insert(id, vec![(now, 1)]);
-        }
-    }
-
-    fn draw_forward(&self) -> Element<'_, RepetitionMessage> {
-        self.draw_card_view(self.settings.forward.as_str())
-    }
-
-    fn draw_backward(&self) -> Element<'_, RepetitionMessage> {
-        if !self.open {
-            return container(text!("?").size(72))
-                .width(Fill)
-                .height(Fill)
-                .align_y(alignment::Vertical::Center)
-                .align_x(Center)
-                .into();
-        }
-
-        self.draw_card_view(self.settings.backward.as_str())
-    }
-
-    fn draw_card_view(&self, properties: &str) -> Element<'_, RepetitionMessage> {
-        let word = &self.current_word;
-
-        let mut col = Column::new();
-
-        for view_type in properties.split(" ") {
-            col = col.push(match view_type {
-                "key" => self.draw_key(word),
-                "value" => self.draw_value(word),
-                "speech" => self.draw_voice(),
-                "reading" => self.draw_reading(word),
-                "context" => self.draw_context(word),
-                "description" => self.draw_description(word),
-                _ => space().into(),
-            })
-        }
-
-        col.spacing(DEFAULT_SPACING).align_x(Center).into()
-    }
-
     fn answer_bar(&self) -> Element<'_, RepetitionMessage> {
         if !self.open {
             return text!("Нажмите Пробел для открытия карточки")
@@ -263,39 +204,6 @@ impl RepetitionState {
         .spacing(DEFAULT_SPACING)
         .into()
     }
-
-    fn draw_key(&self, word: &WordData) -> Element<'_, RepetitionMessage> {
-        text!("{}", word.key).size(36).into()
-    }
-    fn draw_value(&self, word: &WordData) -> Element<'_, RepetitionMessage> {
-        text!("{}", word.value).size(24).into()
-    }
-
-    fn draw_voice(&self) -> Element<'_, RepetitionMessage> {
-        button("Воспроизвести")
-            .style(jl_button)
-            .on_press(RepetitionMessage::Play)
-            .into()
-    }
-
-    fn draw_reading(&self, word: &WordData) -> Element<'_, RepetitionMessage> {
-        match word.additional.get("reading") {
-            None => space().into(),
-            Some(reading) => text!("{}", reading).size(24).into(),
-        }
-    }
-    fn draw_context(&self, word: &WordData) -> Element<'_, RepetitionMessage> {
-        match word.additional.get("context") {
-            None => space().into(),
-            Some(context) => text!("{}", context).size(24).into(),
-        }
-    }
-    fn draw_description(&self, word: &WordData) -> Element<'_, RepetitionMessage> {
-        match word.additional.get("description") {
-            None => space().into(),
-            Some(context) => text!("{}", context).size(24).into(),
-        }
-    }
 }
 
 impl KeyPressedPage for RepetitionState {
@@ -334,7 +242,7 @@ pub enum RepetitionMessage {
     PlayFinished,
 }
 
-async fn play_sound(sink: Arc<Option<MixerDeviceSink>>, text: String) -> MaybeError {
+pub async fn play_sound(sink: Arc<Option<MixerDeviceSink>>, text: String) -> MaybeError {
     let data = get_voice(text.as_str()).await?;
     spawn_blocking(move || {
         if let Some(sink) = sink.as_ref()

src/pages/repetition_settings.rs

@@ -1,48 +1,50 @@
 use crate::app::AppState;
-use crate::data::entities::DeckSettings;
-use crate::data_provider::card_sets::{delete_set, update_deck};
-use crate::data_provider::card_stats::{delete_stats, load_stats_of_deck};
+use crate::core::deck::DeckData;
+use crate::data::entities::{DeckSettings, EntityHandle};
+use crate::data::repositories::{BatchedRepository, Repository};
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::notification::MaybeError;
 use crate::pages::repetition_settings::RepetitionSettingsMessage::*;
 use crate::styling::*;
+use crate::{jl_button, jl_text_input};
 use crate::{push_error, push_error_task};
 use iced::widget::button::danger;
+use iced::widget::space::horizontal;
 use iced::widget::text_input::Catalog;
-use iced::widget::{button, column, row, scrollable, space, text, text_input};
+use iced::widget::{button, column, row, scrollable, space, text};
 use iced::{Element, Task};
 use iced_core::Length::Fill;
-use iced_core::{Padding, Theme, color};
-use parking_lot::Mutex;
+use iced_core::{color, Padding, Theme};
 use std::sync::Arc;
 use std::time::Duration;
 
 pub struct RepetitionSettingsState {
-    set: DeckSettings,
-    index: usize,
-    state: Arc<Mutex<AppState>>,
+    settings_handle: EntityHandle<DeckSettings>,
+    settings_data: DeckSettings,
+    state: AppState,
     real_delete: bool,
+    real_delete_states: bool,
     correct_filter: bool,
     filter_changed: bool,
+    filtered_words: Option<u32>,
 }
 
 impl RepetitionSettingsState {
-    pub(crate) fn new(index: usize, state: Arc<Mutex<AppState>>) -> RepetitionSettingsState {
-        let set;
-        {
-            let local_state = state.lock();
-            set = local_state.decks[index].clone();
-        }
-        let filter_state = set.check_filter();
-
+    pub(crate) fn new(
+        settings: EntityHandle<DeckSettings>,
+        state: AppState,
+    ) -> RepetitionSettingsState {
+        let data = state.decks.read().get_static(settings).unwrap();
         RepetitionSettingsState {
-            index,
-            set,
+            settings_data: data,
+            settings_handle: settings,
             state,
             real_delete: false,
-            correct_filter: filter_state,
+            real_delete_states: false,
+            correct_filter: true,
             filter_changed: false,
+            filtered_words: None,
         }
     }
 }
@@ -61,35 +63,36 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
         match message {
             Back => {}
             Save => {
-                let mut state = self.state.lock();
-                if let Err(e) = update_deck(&mut self.set, &state.connection) {
+                let mut decks = self.state.decks.write();
+                decks.set(&mut self.settings_handle, self.settings_data.clone());
+
+                if let Err(e) = decks.save(&mut self.settings_handle) {
                     return push_error_task!(e);
                 }
+                drop(decks);
                 if self.filter_changed
-                    && let Err(e) = update_deck_stats(&self.set, &state)
+                    && let Err(e) = update_deck_stats(&self.settings_data, &self.state)
                 {
                     return push_error_task!(e);
                 }
-                state.decks[self.index] = self.set.clone();
             }
             SetName(new) => {
-                self.set.name = new;
+                self.settings_data.name = new;
             }
             SetForward(new) => {
-                self.set.forward = new;
+                self.settings_data.forward = new;
             }
             SetBackward(backward) => {
-                self.set.backward = backward;
+                self.settings_data.backward = backward;
             }
             SetFilter(new) => {
-                self.set.filter = new;
-                self.correct_filter = self.set.check_filter();
+                self.settings_data.filter = new;
+                self.correct_filter = self.settings_data.check_filter();
                 self.filter_changed = true;
             }
             TryFilter => {
-                let state = self.state.lock();
-                let count = self.set.get_word_list(&state).len();
-                self.set.count = Some(count);
+                let list = DeckData::list(&self.settings_data, &self.state);
+                self.filtered_words = Some(list.len() as u32);
             }
             DeleteSet => {
                 if !self.real_delete {
@@ -99,15 +102,36 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
                         RootMessage::RepetitionSettings(RevertDeleteSet)
                     });
                 }
-                let mut state = self.state.lock();
-                if let Err(e) = delete_set(&self.set, &state.connection) {
+                let mut decks = self.state.decks.write();
+                if let Err(e) = decks.delete(self.settings_handle) {
                     return push_error_task!(e);
                 }
 
-                state.decks.remove(self.index);
                 return Task::done(RootMessage::RepetitionSettings(Back));
             }
-            RevertDeleteSet => self.real_delete = false,
+            RevertDeleteSet => {
+                self.real_delete = false;
+                self.real_delete_states = true;
+            }
+            DeleteStates => {
+                if !self.real_delete_states {
+                    self.real_delete_states = true;
+                    return Task::future(async {
+                        tokio::time::sleep(Duration::from_millis(3000)).await;
+                        RootMessage::RepetitionSettings(RevertDeleteSet)
+                    });
+                }
+                let mut states = self.state.card_states.write();
+                let deck_id = self.settings_handle.id;
+                let mut query = states
+                    .query(Arc::new(move |state| state.deck_id == deck_id))
+                    .handles()
+                    .collect::<Vec<_>>();
+                if let Err(e) = states.delete_many(query.as_mut_slice()) {
+                    return push_error_task!(e);
+                }
+                self.real_delete_states = false;
+            }
         }
         Task::none()
     }
@@ -119,22 +143,22 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
                     column![
                         column![
                             text!("Название набора"),
-                            text_input("", &self.set.name).on_input(SetName),
+                            jl_text_input!("", &self.settings_data.name).on_input(SetName),
                         ]
                         .spacing(QUARTER_SPACING),
                         column![
                             text!("Передняя сторона"),
-                            text_input("", &self.set.forward).on_input(SetForward),
+                            jl_text_input!("", &self.settings_data.forward).on_input(SetForward),
                         ]
                         .spacing(QUARTER_SPACING),
                         column![
                             text!("Задняя сторона"),
-                            text_input("", &self.set.backward).on_input(SetBackward),
+                            jl_text_input!("", &self.settings_data.backward).on_input(SetBackward),
                         ]
                         .spacing(QUARTER_SPACING),
                         column![
                             text!("Фильтр"),
-                            text_input("", &self.set.filter)
+                            jl_text_input!("", &self.settings_data.filter)
                                 .style(|x, status| {
                                     let mut primary = Theme::default()(x, status);
                                     if !self.correct_filter {
@@ -143,10 +167,8 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
                                     primary
                                 })
                                 .on_input(SetFilter),
-                            button("Проверить фильтр")
-                                .style(jl_button)
-                                .on_press(TryFilter),
-                            self.count_view(&self.set),
+                            jl_button!("Проверить фильтр").on_press(TryFilter),
+                            self.count_view(),
                         ]
                         .spacing(QUARTER_SPACING),
                     ]
@@ -160,7 +182,15 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
                 )
                 .height(Fill),
                 row![
-                    button("Сохранить").style(jl_button).on_press(Save),
+                    jl_button!("Сохранить").on_press(Save),
+                    horizontal(),
+                    button(if self.real_delete_states {
+                        "Вы уверены?"
+                    } else {
+                        "Удалить прогресс?"
+                    })
+                    .style(danger)
+                    .on_press(DeleteStates),
                     button(if self.real_delete {
                         "Вы уверены?"
                     } else {
@@ -168,7 +198,6 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
                     })
                     .style(danger)
                     .on_press(DeleteSet),
-                    space().width(Fill),
                 ]
                 .spacing(DEFAULT_SPACING),
             ]
@@ -180,22 +209,34 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
 }
 
 fn update_deck_stats(deck: &DeckSettings, state: &AppState) -> MaybeError {
-    let mut db_stats = load_stats_of_deck(deck, &state.connection).expect("Wrong db operation");
-    let filtered_words = deck.get_word_list(state);
-    filtered_words.iter().for_each(|word| {
-        let word_id = state.dictionary[*word].id;
-        if let Some(index) = db_stats.iter().position(|stat| stat.word_id == word_id) {
+    let states_repo = &mut state.card_states.write();
+    let deck_id = deck.id;
+    let mut db_stats = states_repo
+        .query_par(Arc::new(move |s| s.deck_id == deck_id))
+        .iter(states_repo)
+        .collect::<Vec<_>>();
+    let filtered_words = DeckData::list(deck, state)
+        .iter()
+        .map(|w| w.id)
+        .collect::<Vec<_>>();
+    filtered_words.iter().for_each(|word_id| {
+        if let Some(index) = db_stats.iter().position(|stat_id| stat_id.word_id == *word_id) {
             db_stats.remove(index);
         }
     });
 
-    delete_stats(db_stats.as_slice(), &state.connection)?;
+    let mut delete_operation = db_stats
+        .iter()
+        .map(|state| EntityHandle::new(state.id, state.id.0 as usize, true))
+        .collect::<Vec<_>>();
+    states_repo.delete_many(delete_operation.as_mut_slice())?;
+
     Ok(())
 }
 
 impl RepetitionSettingsState {
-    fn count_view(&self, set: &DeckSettings) -> Element<'_, RepetitionSettingsMessage> {
-        if let Some(count) = set.count {
+    fn count_view(&self) -> Element<'_, RepetitionSettingsMessage> {
+        if let Some(count) = self.filtered_words {
             return text!("Количество слов: {}", count).into();
         }
         space().into()
@@ -212,5 +253,6 @@ pub enum RepetitionSettingsMessage {
     SetFilter(String),
     TryFilter,
     DeleteSet,
+    DeleteStates,
     RevertDeleteSet,
 }

src/pages/repetitions.rs

@@ -1,12 +1,12 @@
 use crate::app::AppState;
+use crate::core::deck::DeckData;
 use crate::core::srs::{AppendMode, OrderMode};
-use crate::data::Id;
-use crate::data::entities::{CardStatistics, DeckSettings};
-use crate::data_provider::card_sets::update_deck;
-use crate::data_provider::card_stats::{add_stat_list, load_stats_of_deck};
-use crate::navigation::Page::{History, PreviousPage, Repetition, RepetitionSettings};
+use crate::data::entities::{CardState, DeckSettings, EntityHandle, WordData};
+use crate::data::repositories::{BatchedRepository, Repository};
+use crate::navigation::Page::{Exams, History, PreviousPage, Repetition, RepetitionSettings};
 use crate::navigation::{NavigatedPage, Page, RootMessage};
-use crate::notification::{MaybeError, NotificationRequest};
+use crate::notification::MaybeError;
+use crate::pages::exams::ExamsState;
 use crate::pages::history::HistoryState;
 use crate::pages::repetition::RepetitionState;
 use crate::pages::repetition_settings::RepetitionSettingsState;
@@ -14,29 +14,27 @@ use crate::pages::repetitions::RepetitionsMessage::*;
 use crate::push_error;
 use crate::push_error_task;
 use crate::styling::*;
+use crate::{jl_button, jl_text_input};
 use chrono::{Days, Local, Utc};
-use hashbrown::{HashMap, HashSet};
+use hashbrown::HashSet;
+use iced::widget::button::{danger, Status};
 pub use iced::widget::button::{Catalog, Style};
-use iced::widget::button::{Status, danger};
 use iced::widget::tooltip::Position::Top;
 use iced::widget::{
-    Column, Row, button, column, container, lazy, radio, row, scrollable, space, svg, text,
-    text_input, tooltip,
+    button, column, container, lazy, radio, row, scrollable, space, svg, text, tooltip, Column, Row,
 };
 use iced::{Background, Border, Center, Color, Element, Fill, Length, Shadow, Task, Theme};
-use iced_core::Padding;
 use iced_core::border::Radius;
 use iced_core::svg::Handle;
-use parking_lot::Mutex;
+use iced_core::Padding;
+use std::collections::BTreeMap;
 use std::ops::Deref;
 use std::sync::Arc;
 
-#[derive(Clone)]
 pub struct RepetitionsState {
-    word_id_index_map: HashMap<Id, usize>,
-    selected_deck_index: Option<usize>,
-    decks: Vec<DeckViewData>,
-    state: Arc<Mutex<AppState>>,
+    selected_deck_handle: Option<EntityHandle<DeckSettings>>,
+    decks: BTreeMap<EntityHandle<DeckSettings>, DeckRunData>,
+    state: AppState,
 }
 
 impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
@@ -49,11 +47,10 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
                 self.state.clone(),
             )))
         } else if let GoToRepetition = message {
-            let clone = self.state.clone();
-
+            let mut state_clone = self.state.clone();
             let selected_set = self.selected_deck_mut().unwrap();
             if selected_set.append_mode == AppendMode::Full {
-                if let Err(_err) = Self::append_all_words(&mut clone.lock(), selected_set) {
+                if let Err(_err) = Self::append_all_words(&mut state_clone, selected_set) {
                     return None;
                 }
                 selected_set.existing_words_indices = selected_set.available_words_indices.clone();
@@ -66,7 +63,7 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
             }
 
             if let Ok(repetition_state) =
-                RepetitionState::new(selected_set.general_settings.clone(), clone)
+                RepetitionState::new(selected_set.clone(), self.state.clone())
             {
                 return Some(Repetition(repetition_state));
             }
@@ -74,32 +71,32 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
             None
         } else if let GoToSettings = message {
             Some(RepetitionSettings(RepetitionSettingsState::new(
-                self.selected_deck().unwrap().index.unwrap(),
+                self.selected_deck_handle.unwrap(),
                 self.state.clone(),
             )))
-        } else {
-            None
-        }
+        } else if let GoToExams = message {
+            Some(Exams(ExamsState::new(self.selected_deck_handle.unwrap(), self.state.clone())))
+        } else { None }
     }
     fn navigated(&mut self) {
-        if let Some(index) = self.selected_deck_index {
-            let state = self.state.lock();
-            if let Some(global_deck) = state.decks.get(index) {
-                if global_deck.id != self.selected_deck().unwrap().id {
-                    drop(state);
-                    self.decks.remove(index);
+        if let Some(index) = self.selected_deck_handle {
+            let decks = self.state.decks.read();
+            if let Some(deck) = decks.get_static(index) {
+                {
+                    let stored = self.decks.get_mut(&index).unwrap();
+                    stored.general_settings = deck;
+                }
+                drop(decks);
+                self.fill_deck_word_indices();
+            } else {
+                self.decks.remove(&index);
+                drop(decks);
                 self.clear_selection();
-                } else {
-                    self.decks[index].general_settings = state.decks[index].clone();
-                    drop(state);
-                    let _ = self.fill_deck_word_indices();
             }
         } else {
-                drop(state);
-                self.decks.remove(index);
-                self.clear_selection()
-            }
+            self.fill_deck_word_indices();
         }
+        _ = self.state.history.write().reload()
     }
     fn update(&mut self, message: RepetitionsMessage) -> Task<RootMessage> {
         match message {
@@ -111,31 +108,32 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
 
             CreateSet => {
                 let index = self.decks.len() + 1;
-                self.decks.push(DeckViewData {
-                    general_settings: DeckSettings::with_name(format!("Колода #{}", index)),
+                let general = DeckSettings::with_name(format!("Колода #{}", index));
+                let handle = self.state.decks.write().create(general.clone());
+                self.decks.insert(
+                    handle,
+                    DeckRunData {
+                        settings_handle: handle,
+                        general_settings: general,
                         existing_words_indices: Default::default(),
                         available_words_indices: Default::default(),
                         indices_ready: false,
                         append_mode: Default::default(),
-                    index: None,
-                });
+                        count: None,
+                        open_mode: OrderMode::Default,
+                    },
+                );
             }
             DeleteSet => {
-                let index = self.selected_deck_index.unwrap();
+                let index = self.selected_deck_handle.unwrap();
                 self.clear_selection();
-                let deck = self.decks.remove(index);
-                if deck.id.is_valid() {
-                    let mut state = self.state.lock();
-                    state.decks.remove(index);
-                    self.decks = self
-                        .decks
-                        .clone()
-                        .into_iter()
-                        .map(|mut deck| {
-                            deck.index = state.decks.iter().position(|d| d.id == deck.id);
-                            deck
-                        })
-                        .collect();
+                self.decks.remove(&index);
+
+                if index.real() {
+                    let mut repo = self.state.decks.write();
+                    if let Err(err) = repo.delete(index) {
+                        return push_error_task!(err);
+                    }
                 }
             }
             SetName(value) => {
@@ -145,29 +143,24 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
             SelectSet(index) => {
                 self.select_deck(index);
                 let deck = self.selected_deck().unwrap();
-                if !deck.indices_ready
-                    && let Err(err) = self.fill_deck_word_indices()
-                {
-                    return push_error_task!(err);
+                if !deck.indices_ready {
+                    self.fill_deck_word_indices()
                 }
             }
             Save => {
-                let mut deck = self.selected_deck().unwrap().clone();
-                let mut state = self.state.lock();
-                {
-                    if let Err(e) = update_deck(&mut deck.general_settings, &state.connection) {
-                        return Task::done(RootMessage::PushNotification(
-                            NotificationRequest::Error(e),
-                        ));
-                    }
-                    if let Some(index) = deck.index {
-                        state.decks[index] = deck.general_settings.clone();
-                    } else {
-                        state.decks.push(deck.general_settings.clone());
-                        deck.index = Some(state.decks.len() - 1);
-                        self.decks[self.selected_deck_index.unwrap()] = deck.clone();
-                    }
+                let deck = self.selected_deck().unwrap().clone();
+                let handle = self.selected_deck_handle.as_mut().unwrap();
+                let mut repo = self.state.decks.write();
+
+                repo.set(handle, deck.general_settings.clone());
+                let old = *handle;
+                if let Err(err) = repo.save(handle) {
+                    return push_error_task!(err);
                 }
+
+                let mut deck = self.decks.remove(&old).unwrap();
+                deck.settings_handle = *handle;
+                self.decks.insert(*handle, deck);
             }
             SetForward(value) => {
                 let deck = self.selected_deck_mut().unwrap();
@@ -182,23 +175,21 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
                 deck.general_settings.filter = value;
             }
             TryFilter => {
-                let state = self.state.lock();
                 let deck = self.selected_deck().unwrap();
-                let count = deck.get_word_list(&state).len();
-                drop(state);
+                let count = DeckData::list(deck, &self.state).len();
                 let deck = self.selected_deck_mut().unwrap();
-                deck.general_settings.count = Some(count);
+                deck.count = Some(count);
             }
             SetOpenMode(mode) => {
                 let deck = self.selected_deck_mut().unwrap();
-                deck.general_settings.open_mode = mode;
+                deck.open_mode = mode;
             }
             SetAppendMode(mode) => {
                 let deck = self.selected_deck_mut().unwrap();
                 deck.append_mode = mode;
             }
             AppendWords(count) => {
-                let adding: Vec<usize>;
+                let adding: Vec<EntityHandle<WordData>>;
                 {
                     {
                         let deck = self.selected_deck().unwrap();
@@ -220,14 +211,15 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
                     deck.existing_words_indices.append(&mut adding.clone());
                 }
 
-                let deck = self.selected_deck().unwrap();
-                let mut state = self.state.lock();
+                let deck = self.selected_deck().unwrap().clone();
+                let state = &mut self.state;
                 if let Err(err) =
-                    Self::append_words(&mut state, &deck.general_settings, adding.into_iter())
+                    Self::append_words(state, &deck.general_settings, adding.into_iter())
                 {
                     return push_error_task!(err);
                 }
             }
+            GoToExams => {}
         }
         Task::none()
     }
@@ -237,10 +229,7 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
             row![
                 column![
                     scrollable(self.decks_list()).height(Fill),
-                    button("Добавить")
-                        .style(jl_button)
-                        .width(Fill)
-                        .on_press(CreateSet),
+                    jl_button!("Добавить").width(Fill).on_press(CreateSet),
                 ]
                 .spacing(DEFAULT_SPACING)
                 .width(Length::FillPortion(1)),
@@ -257,47 +246,42 @@ impl NavigatedPage<RepetitionsMessage> for RepetitionsState {
 }
 
 impl RepetitionsState {
-    pub(crate) fn new(state: Arc<Mutex<AppState>>) -> RepetitionsState {
-        let state_ = state.lock();
-        let mut map = HashMap::with_capacity(state_.dictionary.len());
-
-        state_
-            .dictionary
-            .iter()
-            .enumerate()
-            .for_each(|(index, word)| {
-                map.insert(word.id, index);
-            });
-
-        let decks = Self::get_decks_from_state(&state_);
-        drop(state_);
+    pub(crate) fn new(state: AppState) -> RepetitionsState {
+        let decks = Self::get_decks_from_state(&state);
         RepetitionsState {
-            word_id_index_map: map,
-            selected_deck_index: None,
+            selected_deck_handle: None,
             decks,
             state,
         }
     }
 
-    fn get_decks_from_state(state: &AppState) -> Vec<DeckViewData> {
+    fn get_decks_from_state(state: &AppState) -> BTreeMap<EntityHandle<DeckSettings>, DeckRunData> {
         state
             .decks
+            .read()
             .iter()
             .enumerate()
-            .map(|(index, deck)| DeckViewData {
+            .map(|(index, deck)| {
+                (
+                    EntityHandle::new(deck.id, index, true),
+                    DeckRunData {
+                        settings_handle: EntityHandle::new(deck.id, index, true),
                         general_settings: deck.clone(),
                         existing_words_indices: Default::default(),
                         available_words_indices: Default::default(),
                         indices_ready: false,
                         append_mode: Default::default(),
-                index: Some(index),
+                        count: None,
+                        open_mode: OrderMode::Default,
+                    },
+                )
             })
-            .collect()
+            .collect::<BTreeMap<_, _>>()
     }
 }
 
 impl RepetitionsState {
-    fn launch_delete_button(&self, deck: &DeckViewData) -> Element<'_, RepetitionsMessage> {
+    fn launch_delete_button(&self, deck: &DeckRunData) -> Element<'_, RepetitionsMessage> {
         if deck.id.is_valid() {
             if deck.append_mode == AppendMode::Manual && deck.existing_words_indices.is_empty() {
                 return text!("Добавьте карточки или измените фильтр").into();
@@ -320,7 +304,7 @@ impl RepetitionsState {
                         column![
                             text!("Название набора"),
                             row![
-                                text_input("", &deck.name).on_input(SetName),
+                                jl_text_input!("", &deck.name).on_input(SetName),
                                 button(svg(Handle::from_memory(SETTINGS_ICON)))
                                     .width(43)
                                     .on_press(GoToSettings),
@@ -329,24 +313,22 @@ impl RepetitionsState {
                         ]
                         .spacing(QUARTER_SPACING),
                         {
-                            if !deck.id.is_valid() {
+                            if !deck.settings_handle.real() {
                                 column![
                                     column![
                                         text!("Передняя сторона"),
-                                        text_input("", &deck.forward).on_input(SetForward),
+                                        jl_text_input!("", &deck.forward).on_input(SetForward),
                                     ]
                                     .spacing(QUARTER_SPACING),
                                     column![
                                         text!("Задняя сторона"),
-                                        text_input("", &deck.backward).on_input(SetBackward),
+                                        jl_text_input!("", &deck.backward).on_input(SetBackward),
                                     ]
                                     .spacing(QUARTER_SPACING),
                                     column![
                                         text!("Фильтр"),
-                                        text_input("", &deck.filter).on_input(SetFilter),
-                                        button("Проверить фильтр")
-                                            .style(jl_button)
-                                            .on_press(TryFilter),
+                                        jl_text_input!("", &deck.filter).on_input(SetFilter),
+                                        jl_button!("Проверить фильтр").on_press(TryFilter),
                                         self.count_view(deck),
                                     ]
                                     .spacing(QUARTER_SPACING),
@@ -374,7 +356,10 @@ impl RepetitionsState {
                                         Some(deck.open_mode),
                                         SetOpenMode
                                     ),
-                                    button("История").style(jl_button).on_press(GoToHistory),
+                                    row![
+                                        jl_button!("История").on_press(GoToHistory),
+                                        jl_button!("Экзамены").on_press(GoToExams),
+                                    ].spacing(DEFAULT_SPACING),
                                 ]
                                 .spacing(HALF_SPACING)
                             }
@@ -391,7 +376,7 @@ impl RepetitionsState {
                 )
                 .height(Fill),
                 row![
-                    button("Сохранить").style(jl_button).on_press(Save),
+                    jl_button!("Сохранить").on_press(Save),
                     self.launch_delete_button(deck)
                 ]
                 .spacing(DEFAULT_SPACING)
@@ -412,22 +397,20 @@ impl RepetitionsState {
     fn activity_bar(&self, deck: &DeckSettings) -> Element<'_, RepetitionsMessage> {
         const MAX_DAY_COUNT: f32 = 128.0;
 
-        let state = self.state.lock();
-        let history = state.activity.get(&deck.id);
+        let history = self.state.history.read();
+        let history = history.activity_of_deck(deck.id);
         let mut counts: Vec<u32> = vec![0; 30 * 7];
         let now = Local::now().date_naive();
 
-        if let Some(history) = history {
         for (date, activity) in history {
-                let distance = now - *date;
+            let distance = now - date;
             let index = counts.len() as i64 - distance.num_days() - 1;
 
             if index < 0 {
                 continue;
             }
 
-                counts[index as usize] = *activity;
-            }
+            counts[index as usize] = activity;
         }
 
         lazy((counts, now), |(counts, now)| {
@@ -483,7 +466,7 @@ impl RepetitionsState {
         })
         .into()
     }
-    fn word_append_panel(&self, deck: &DeckViewData) -> Element<'_, RepetitionsMessage> {
+    fn word_append_panel(&self, deck: &DeckRunData) -> Element<'_, RepetitionsMessage> {
         column![
             text!("Режим добавления карточек"),
             row![
@@ -506,7 +489,7 @@ impl RepetitionsState {
         .spacing(HALF_SPACING)
         .into()
     }
-    fn adder_panel(&self, deck: &DeckViewData) -> Element<'_, RepetitionsMessage> {
+    fn adder_panel(&self, deck: &DeckRunData) -> Element<'_, RepetitionsMessage> {
         match deck.append_mode {
             AppendMode::Full => space().into(),
             AppendMode::Manual => row![
@@ -526,7 +509,7 @@ impl RepetitionsState {
         let available = selected_deck.available_words_indices.len();
         text!("{} слова добавлено из {}", now, available).into()
     }
-    fn count_view(&self, deck: &DeckSettings) -> Element<'_, RepetitionsMessage> {
+    fn count_view(&self, deck: &DeckRunData) -> Element<'_, RepetitionsMessage> {
         if let Some(count) = deck.count {
             return text!("Количество слов: {}", count).into();
         }
@@ -535,10 +518,10 @@ impl RepetitionsState {
     fn decks_list(&self) -> Column<'_, RepetitionsMessage> {
         let mut column = Column::new();
 
-        for (i, deck) in self.decks.iter().enumerate() {
+        for (handle, deck) in self.decks.iter() {
             column = column.push(
                 button(text!("{}", &deck.name))
-                    .on_press_with(move || SelectSet(i))
+                    .on_press_with(move || SelectSet(*handle))
                     .style(move |_x: &Theme, status: Status| Style {
                         background: if status == Status::Hovered {
                             Some(Background::Color(Color::WHITE.scale_alpha(0.2)))
@@ -562,7 +545,7 @@ impl RepetitionsState {
 }
 
 impl RepetitionsState {
-    fn append_all_words(state: &mut AppState, deck: &DeckViewData) -> MaybeError {
+    fn append_all_words(state: &mut AppState, deck: &DeckRunData) -> MaybeError {
         let existing = &deck.existing_words_indices;
         let mut created_set = HashSet::with_capacity(existing.len());
         existing.iter().for_each(|c| {
@@ -579,57 +562,59 @@ impl RepetitionsState {
     fn append_words(
         state: &mut AppState,
         deck: &DeckSettings,
-        indices: impl Iterator<Item = usize>,
+        indices: impl Iterator<Item = EntityHandle<WordData>>,
     ) -> MaybeError {
-        let words = &state.dictionary;
         let stats = &mut indices
-            .map(|i| {
-                let word = &words[i];
-                CardStatistics {
+            .map(|i| CardState {
                 id: 0.into(),
-                    word_id: word.id,
+                word_id: i.id,
                 last_open: Utc::now(),
                 score: 1,
-                    set_id: deck.id,
-                }
+                fsrs_opened: Utc::now().date_naive(),
+                fsrs_memory: None,
+                deck_id: deck.id,
+                fsrs_open_day: Utc::now().date_naive(),
             })
             .collect::<Vec<_>>();
 
         if !stats.is_empty() {
-            add_stat_list(stats, &mut state.connection)?;
+            let mut repo = state.card_states.write();
+            repo.create_now_many(stats.as_mut_slice())?;
         }
         Ok(())
     }
 
-    fn select_deck(&mut self, index: usize) {
-        if self.decks.get(index).is_some() {
-            self.selected_deck_index = Some(index);
+    fn select_deck(&mut self, index: EntityHandle<DeckSettings>) {
+        if self.decks.contains_key(&index) {
+            self.selected_deck_handle = Some(index);
         }
     }
 
-    fn selected_deck(&self) -> Option<&DeckViewData> {
-        self.decks.get(self.selected_deck_index?)
+    fn selected_deck(&self) -> Option<&DeckRunData> {
+        self.decks.get(&self.selected_deck_handle?)
     }
-    fn selected_deck_mut(&mut self) -> Option<&mut DeckViewData> {
-        self.decks.get_mut(self.selected_deck_index?)
+    fn selected_deck_mut(&mut self) -> Option<&mut DeckRunData> {
+        self.decks.get_mut(&self.selected_deck_handle?)
     }
 
     fn clear_selection(&mut self) {
-        self.selected_deck_index = None;
+        self.selected_deck_handle = None;
     }
 
-    fn fill_deck_word_indices(&mut self) -> MaybeError {
-        let state = &self.state.lock();
+    fn fill_deck_word_indices(&mut self) {
+        let card_states = self.state.card_states.read();
+        let deck_id = self.selected_deck().unwrap().id;
+        let added = card_states
+            .query_par(Arc::new(move |state| state.deck_id == deck_id))
+            .iter(&card_states)
+            .map(|state| EntityHandle::from_id(state.word_id))
+            .collect::<Vec<_>>();
         let mut deck = self.selected_deck().unwrap().clone();
-        let added: Vec<_> = load_stats_of_deck(&deck, &state.connection)?
-            .iter()
-            .map(|c| self.word_id_index_map[&c.word_id])
-            .collect();
-        let total = deck.get_word_list(state);
+        let total = DeckData::list(&deck, &self.state);
         deck.existing_words_indices = added;
         deck.available_words_indices = total;
-        self.decks[self.selected_deck_index.unwrap()] = deck;
-        Ok(())
+        deck.indices_ready = true;
+        self.decks.insert(self.selected_deck_handle.unwrap(), deck);
     }
 }
 #[derive(Clone)]
@@ -640,7 +625,7 @@ pub enum RepetitionsMessage {
     CreateSet,
     DeleteSet,
     SetName(String),
-    SelectSet(usize),
+    SelectSet(EntityHandle<DeckSettings>),
     Save,
     SetForward(String),
     SetBackward(String),
@@ -649,21 +634,24 @@ pub enum RepetitionsMessage {
     SetOpenMode(OrderMode),
     SetAppendMode(AppendMode),
     GoToHistory,
+    GoToExams,
     GoToSettings,
     AppendWords(usize),
 }
 
 #[derive(Clone)]
-struct DeckViewData {
-    general_settings: DeckSettings,
-    existing_words_indices: Vec<usize>,
-    available_words_indices: Vec<usize>,
+pub struct DeckRunData {
+    pub settings_handle: EntityHandle<DeckSettings>,
+    pub general_settings: DeckSettings,
+    existing_words_indices: Vec<EntityHandle<WordData>>,
+    available_words_indices: Vec<EntityHandle<WordData>>,
     indices_ready: bool,
-    append_mode: AppendMode,
-    index: Option<usize>,
+    pub append_mode: AppendMode,
+    count: Option<usize>,
+    pub open_mode: OrderMode,
 }
 
-impl Deref for DeckViewData {
+impl Deref for DeckRunData {
     type Target = DeckSettings;
 
     fn deref(&self) -> &Self::Target {

src/pages/selector.rs

@@ -1,5 +1,6 @@
 use crate::app::AppState;
 use crate::core::kana_set::{KanaSet, KanaType};
+use crate::jl_button;
 use crate::navigation::Page::*;
 use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::pages::dictionary::DictionaryState;
@@ -16,13 +17,11 @@ use iced::{Element, Task, alignment};
 use iced_core::Alignment::Center;
 use iced_core::Background;
 use iced_core::Color;
-use parking_lot::Mutex;
-use std::sync::Arc;
 
 pub struct SelectorState {
     pub set: KanaSet,
     is_writing: bool,
-    state: Arc<Mutex<AppState>>,
+    state: AppState,
 }
 
 #[derive(Debug, Clone)]
@@ -81,9 +80,7 @@ impl NavigatedPage<SelectorMessage> for SelectorState {
         container(
             iced::widget::column![
                 row![
-                    button("あ ↔ ア")
-                        .on_press(SelectorMessage::Change)
-                        .style(jl_button),
+                    jl_button!("あ ↔ ア").on_press(SelectorMessage::Change),
                     button("Словарь")
                         .on_press(SelectorMessage::ToDictionary)
                         .style(Self::nav_style),
@@ -114,7 +111,7 @@ impl NavigatedPage<SelectorMessage> for SelectorState {
 }
 
 impl SelectorState {
-    pub fn new(state: Arc<Mutex<AppState>>) -> Self {
+    pub fn new(state: AppState) -> Self {
         Self {
             set: Default::default(),
             is_writing: false,

src/pages/sync.rs

@@ -1,6 +1,8 @@
-use crate::app::{AppState, fill_state};
+use crate::app::AppState;
+use crate::data::repositories::Repository;
 use crate::data_provider::settings::{delete_settings, set_setting};
 use crate::data_provider::web_api::*;
+use crate::jl_button;
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::notification::{NotificationData, NotificationRequest};
@@ -12,9 +14,8 @@ use iced::widget::container::rounded_box;
 use iced::widget::{button, column, container, progress_bar, row, space, text, toggler};
 use iced::{Center, Element, Fill, Font, Length, Task};
 use log::error;
-use parking_lot::Mutex;
-use std::sync::Arc;
 use std::time::Duration;
+use crate::notification::NotificationData::LocalVersionChanged;
 
 #[derive(Clone)]
 pub enum SyncMessage {
@@ -31,12 +32,13 @@ pub enum SyncMessage {
     Disable,
     DisableSync,
     SwitchAutoSync,
+    ResetRealLoad,
 }
-#[derive(Clone)]
 pub struct SyncState {
-    state: Arc<Mutex<AppState>>,
+    state: AppState,
     auto_fetch: bool,
     frozen: bool,
+    real_load: bool,
     progress: f32,
 }
 
@@ -56,8 +58,7 @@ impl NavigatedPage<SyncMessage> for SyncState {
         match message {
             Back => {}
             CopyKey => {
-                let state = self.state.lock();
-                let key = state.sync_data.key.clone().unwrap();
+                let key = self.state.sync_data.read().key.clone().unwrap();
                 return iced::clipboard::write(key)
                     .map(|_val: String| RootMessage::Sync(KeyCopied));
             }
@@ -76,16 +77,20 @@ impl NavigatedPage<SyncMessage> for SyncState {
                 if !validate_id(&new_id) {
                     return Task::none();
                 }
-                let mut state = self.state.lock();
-                state.sync_data.key = Some(new_id.clone());
-                if let Err(err) = set_setting("SYNC_KEY".to_string(), new_id, &state.connection) {
+                let mut settings = self.state.sync_data.write();
+                settings.key = Some(new_id.clone());
+                if let Err(err) = set_setting(
+                    "SYNC_KEY".to_string(),
+                    new_id,
+                    &self.state.connection.lock(),
+                ) {
                     return push_error_task!(err);
                 }
             }
             Send => {
                 self.prepare_to_db_interaction();
 
-                let id = self.state.lock().sync_data.key.clone().unwrap();
+                let id = self.state.sync_data.read().key.clone().unwrap();
                 let tasks = Task::batch([
                     Task::perform(
                         async { tokio::time::sleep(Duration::from_millis(200)).await },
@@ -97,13 +102,29 @@ impl NavigatedPage<SyncMessage> for SyncState {
                 return tasks;
             }
             GetLast => {
-                let id = self.state.lock().sync_data.key.clone().unwrap();
+                if !self.real_load {
+                    self.real_load = true;
+                    return Task::batch([
+                        Task::future(async {
+                            tokio::time::sleep(Duration::from_millis(3000)).await;
+                            RootMessage::Sync(ResetRealLoad)
+                        }),
+                        Task::done(RootMessage::PushNotification(NotificationRequest::Warning(LocalVersionChanged)))
+                    ]);
+                }
+
+                self.real_load = false;
+                let id = self.state.sync_data.read().key.clone().unwrap();
+                self.state.connection.lock().finish();
                 let tasks = Task::batch([
                     Task::perform(
                         async { tokio::time::sleep(Duration::from_millis(200)).await },
                         |_| RootMessage::Sync(NextAnimation),
                     ),
-                    Task::perform(load_data(id, false), |_| RootMessage::Sync(NetworkFinished)),
+                    Task::perform(load_data(id, false), |load_result| match load_result {
+                        Ok(_) => RootMessage::Sync(NetworkFinished),
+                        Err(error) => push_error!(error)
+                    }),
                 ]);
 
                 return tasks;
@@ -122,26 +143,27 @@ impl NavigatedPage<SyncMessage> for SyncState {
             }
             NetworkFinished => {
                 self.frozen = false;
-                let mut updated_state = AppState::new();
-                fill_state(&mut updated_state);
+                {
+                    let mut connection = self.state.connection.lock();
+                    connection.restart();
+                }
+
+                if let Err(err) = self.reload_data() {
+                    return push_error_task!(err);
+                }
 
-                let mut state = self.state.lock();
-                state.sync_data = updated_state.sync_data;
-                state.connection = updated_state.connection;
-                state.decks = updated_state.decks;
-                state.dictionary = updated_state.dictionary;
-                state.word_groups = updated_state.word_groups;
                 return Task::done(RootMessage::PushNotification(NotificationRequest::Info(
-                    NotificationData::DataLoaded,
+                    NotificationData::DataSynced,
                 )));
             }
             Disable => {}
             DisableSync => {
-                let mut state = self.state.lock();
-                state.sync_data.key = None;
+                let mut sync_data = self.state.sync_data.write();
+                let connection = self.state.connection.lock();
+                sync_data.key = None;
                 let save_result = || {
-                    delete_settings("SYNC_KEY".to_string(), &state.connection)?;
-                    delete_settings("AUTO_WEB_FETCH".to_string(), &state.connection)?;
+                    delete_settings("SYNC_KEY".to_string(), &connection)?;
+                    delete_settings("AUTO_WEB_FETCH".to_string(), &connection)?;
                     Ok::<(), NotificationData>(())
                 };
 
@@ -151,16 +173,21 @@ impl NavigatedPage<SyncMessage> for SyncState {
             }
             SwitchAutoSync => {
                 self.auto_fetch = !self.auto_fetch;
-                let mut state = self.state.lock();
-                state.sync_data.auto_web_fetch = self.auto_fetch;
+                let mut sync_data = self.state.sync_data.write();
+                let connection = self.state.connection.lock();
+
+                sync_data.auto_web_fetch = self.auto_fetch;
                 if let Err(err) = set_setting(
                     "AUTO_WEB_FETCH".to_string(),
                     self.auto_fetch.to_string(),
-                    &state.connection,
+                    &connection,
                 ) {
                     return push_error_task!(err);
                 }
             }
+            ResetRealLoad => {
+                self.real_load = false;
+            }
         }
         Task::none()
     }
@@ -177,19 +204,29 @@ impl NavigatedPage<SyncMessage> for SyncState {
 }
 
 impl SyncState {
-    pub fn new(state: Arc<Mutex<AppState>>) -> SyncState {
-        let auto_fetch;
-        {
-            auto_fetch = state.lock().sync_data.auto_web_fetch;
-        }
+    pub fn new(state: AppState) -> SyncState {
+        let auto_fetch = state.sync_data.read().auto_web_fetch;
+
         Self {
             auto_fetch,
             state,
             frozen: false,
+            real_load: false,
             progress: 0.0,
         }
     }
 
+    fn reload_data(&mut self) -> Result<(), NotificationData> {
+        self.state.card_states.write().reload()?;
+        self.state.word_groups.write().reload()?;
+        self.state.decks.write().reload()?;
+        self.state.dictionary.write().reload()?;
+        self.state.history.write().reload()?;
+        self.state.exam.write().reload()?;
+        self.state.exam_entries.write().reload()?;
+        Ok(())
+    }
+
     fn sync_column(&self) -> Element<'_, SyncMessage> {
         let network_view: Element<'_, SyncMessage> = if self.frozen {
             progress_bar(0.0..=5.0, self.progress).into()
@@ -197,7 +234,7 @@ impl SyncState {
             space().into()
         };
         {
-            if let Some(key) = self.state.lock().sync_data.key.clone() {
+            if let Some(key) = self.state.sync_data.read().key.as_ref() {
                 column![
                     text!("Ваш ключ синхронизации"),
                     container(
@@ -209,14 +246,13 @@ impl SyncState {
                         .padding(3)
                     )
                     .style(rounded_box),
-                    button("Скопировать в буфер обмена")
-                        .style(jl_button)
+                    jl_button!("Скопировать в буфер обмена")
                         .on_press(CopyKey)
                         .width(Fill),
                     row![
-                        button("↑ Отправить").style(jl_button).on_press(Send),
+                        jl_button!("↑ Отправить").on_press(Send),
                         space().width(Fill),
-                        button("↓ Скачать").style(jl_button).on_press(GetLast)
+                        jl_button!("↓ Скачать").on_press(GetLast)
                     ]
                     .spacing(DEFAULT_SPACING),
                     toggler(self.auto_fetch)
@@ -229,12 +265,8 @@ impl SyncState {
                 ]
             } else {
                 column![
-                    button("Создать сохранение")
-                        .style(jl_button)
-                        .on_press(InitSync),
-                    button("Вставить ключ из буфера")
-                        .style(jl_button)
-                        .on_press(GetKey),
+                    jl_button!("Создать сохранение").on_press(InitSync),
+                    jl_button!("Вставить ключ из буфера").on_press(GetKey),
                 ]
             }
         }
@@ -254,13 +286,24 @@ impl SyncState {
         }
         self.frozen = true;
         self.progress = 0.0;
-        let state = self.state.lock();
-        state
-            .connection
+        let mut connection = self.state.connection.lock();
+
+        connection
             .query_row("PRAGMA wal_checkpoint(TRUNCATE)", [], |_| Ok(()))
             .unwrap_or_else(|e| {
                 error!("Ошибка при checkpoint WAL: {e}");
             });
+        connection.execute("VACUUM;", []).unwrap_or_else(|e| {
+            error!("Ошибка при checkpoint WAL: {e}");
+            0
+        });
+        connection
+            .execute("PRAGMA optimize;", [])
+            .unwrap_or_else(|e| {
+                error!("Ошибка при checkpoint WAL: {e}");
+                0
+            });
+        connection.finish();
     }
 }
 

src/pages/word.rs

@@ -1,180 +1,154 @@
 use crate::app::AppState;
-use crate::data::entities::WordData;
-use crate::data_provider::words::{delete_word, update_word};
-use crate::navigation::Page::PreviousPage;
-use crate::navigation::{NavigatedPage, Page, RootMessage};
+use crate::data::Id;
+use crate::data::entities::{CustomField, EntityHandle, WordData};
+use crate::data::repositories::Repository;
+use crate::jl_text_input;
 use crate::pages::word::WordMessage::*;
-use crate::push_error;
-use crate::push_error_task;
 use crate::styling::*;
 use iced::widget::button::danger;
-use iced::widget::{button, column, row, rule, scrollable, text, text_input};
-use iced::{Element, Fill, Task};
-use parking_lot::Mutex;
-use std::sync::Arc;
+use iced::widget::space::horizontal;
+use iced::widget::{button, column, row, rule, scrollable, text};
+use iced::{Element, Fill};
+use iced_core::Padding;
 
-#[derive(Clone)]
-pub struct WordState {
-    state: Arc<Mutex<AppState>>,
-    index: usize,
-    word: WordData,
+pub struct WordEditor<Message : Clone> {
+    state: AppState,
+    pub word_handle: EntityHandle<WordData>,
+    on_delete: Option<Message>,
+    on_edit: Option<Message>,
+    fields: Vec<CustomField>,
 }
 
-impl NavigatedPage<WordMessage> for WordState {
-    fn navigate(&mut self, message: &WordMessage) -> Option<Page> {
-        if let Back = message {
-            Some(PreviousPage)
-        } else {
-            None
-        }
-    }
-
-    fn navigated(&mut self) {}
-    fn update(&mut self, message: WordMessage) -> Task<RootMessage> {
+impl<Message: std::clone::Clone> WordEditor<Message> {
+    pub(crate) fn update(&mut self, message: WordMessage) -> Option<Message> {
+        let dictionary = &mut self.state.dictionary.write();
+        let word = dictionary.get_mut(&mut self.word_handle).unwrap();
         match message {
-            Back => {}
-            Save => {
-                let mut state = self.state.lock();
-                state.dictionary[self.index] = self.word.clone();
-
-                if let Err(err) = update_word(&mut self.word, &state.connection) {
-                    return push_error_task!(err);
-                }
-                return Task::done(RootMessage::Word(Back));
-            }
             Delete => {
-                let mut state = self.state.lock();
-                state.dictionary.remove(self.index);
-                if let Err(err) = delete_word(&self.word, &state.connection) {
-                    return push_error_task!(err);
+                return self.on_delete.clone();
             }
-                return Task::done(RootMessage::Word(Back));
-            }
-            SetTags(n) => self.word.tags = n,
+            SetTags(n) => word.tags = n,
             SetKey(n) => {
-                self.word.key = n;
+                word.key = n;
             }
             SetValue(n) => {
-                self.word.value = n;
+                word.value = n;
             }
             SetAdditional(key, value) => {
-                self.word.additional.insert(key, value.clone());
+                word.additional.insert(key, value.replace("", ""));
             }
             AddAdditional(key) => {
-                self.word.additional.insert(key, "".to_string());
+                word.additional.insert(key, String::new());
             }
             RemoveAdditional(key) => {
-                self.word.additional.remove(key.as_str());
+                word.additional.remove(&key);
             }
         }
-        Task::none()
+        self.on_edit.clone()
     }
 
-    fn view(&self) -> Element<'_, WordMessage> {
+    pub(crate) fn view(&self) -> Element<'_, WordMessage> {
         let mut fast_add = row![];
-        if !self.word.additional.contains_key("reading") {
+        let word = self
+            .state
+            .dictionary
+            .read()
+            .get_static(self.word_handle)
+            .unwrap();
+        for field in &self.fields {
+            if !word.additional.contains_key(&field.id) {
                 fast_add = fast_add.push(
-                button("Чтение")
+                    button(field.name.as_str())
                         .style(button::text)
-                    .on_press(AddAdditional("reading".to_string())),
+                        .on_press(AddAdditional(field.id)),
                 );
             }
-        if !self.word.additional.contains_key("description") {
-            fast_add = fast_add.push(
-                button("Описание")
-                    .style(button::text)
-                    .on_press(AddAdditional("description".to_string())),
-            );
-        }
-
-        if !self.word.additional.contains_key("context") {
-            fast_add = fast_add.push(
-                button("В контексте")
-                    .style(button::text)
-                    .on_press(AddAdditional("context".to_string())),
-            );
         }
 
         let mut col = iced::widget::column![
             column![
                 text!("Ключ"),
-                text_input("key", &self.word.key).on_input(SetKey),
+                jl_text_input!("key", &word.key).on_input(SetKey),
             ]
             .spacing(QUARTER_SPACING),
             column![
                 text!("Значение"),
-                text_input("value", &self.word.value).on_input(SetValue),
+                jl_text_input!("value", &word.value).on_input(SetValue),
             ]
             .spacing(QUARTER_SPACING),
             column![
                 text!("Теги"),
-                text_input("tags", &self.word.tags).on_input(SetTags),
+                jl_text_input!("tags", &word.tags).on_input(SetTags),
             ]
             .spacing(QUARTER_SPACING),
             rule::horizontal(2),
-            scrollable(fast_add),
+            scrollable(fast_add.padding(Padding {
+                top: 0.0,
+                right: 0.0,
+                bottom: 4.0,
+                left: 0.0,
+            }))
+            .horizontal(),
         ];
 
-        for more in &self.word.additional {
+        for more in &word.additional {
             col = col.push(self.get_view_for_more(more));
         }
 
-        back_overlay(
         column![
             col.spacing(DEFAULT_SPACING / 2.0).width(Fill).height(Fill),
             row![
-                    button("Сохранить").style(jl_button).on_press(Save),
+                horizontal().width(Fill),
                 button("Удалить").style(danger).on_press(Delete),
             ]
             .spacing(DEFAULT_SPACING)
         ]
         .spacing(DEFAULT_SPACING)
-            .into(),
-            Back,
-        )
+        .into()
     }
 }
 
-impl WordState {
-    pub(crate) fn new(word: WordData, index: usize, state: Arc<Mutex<AppState>>) -> WordState {
-        WordState { state, index, word }
+impl<Message: std::clone::Clone> WordEditor<Message> {
+    pub fn new(handle: EntityHandle<WordData>, state: AppState) -> Self {
+        let fields = state
+            .custom_fields
+            .read()
+            .iter()
+            .cloned()
+            .collect::<Vec<_>>();
+        Self {
+            state,
+            word_handle: handle,
+            on_delete: None,
+            on_edit: None,
+            fields,
         }
     }
 
-impl WordState {
-    fn get_view_for_more(&self, value: (&String, &String)) -> Element<'_, WordMessage> {
-        match value.0.as_str() {
-            "reading" => self.reading_field(value.1),
-            "description" => self.description_field(value.1),
-            "context" => self.context_field(value.1),
-            _ => self.additional_field(value.1, value.0.clone(), value.0.clone()),
+    pub fn on_delete(mut self, message: Message) -> Self {
+        self.on_delete = Some(message);
+        self
+    }
+    pub fn on_edit(mut self, message: Message) -> Self {
+        self.on_edit = Some(message);
+        self
     }
 }
 
-    fn reading_field(&self, value: &str) -> Element<'_, WordMessage> {
-        self.additional_field(value, "Чтение слова".to_string(), "reading".to_string())
+impl<Message: std::clone::Clone> WordEditor<Message> {
+    fn get_view_for_more(&self, value: (&Id, &String)) -> Element<'_, WordMessage> {
+        let field = self.fields.iter().find(|f| f.id == *value.0).unwrap();
+        self.additional_field(value.1, field.name.as_str(), *value.0)
     }
 
-    fn description_field(&self, value: &str) -> Element<'_, WordMessage> {
-        self.additional_field(value, "Описание".to_string(), "description".to_string())
-    }
-
-    fn context_field(&self, value: &str) -> Element<'_, WordMessage> {
-        self.additional_field(value, "В контексте".to_string(), "context".to_string())
-    }
-    fn additional_field(&self, value: &str, name: String, id: String) -> Element<'_, WordMessage> {
+    fn additional_field(&self, value: &str, name: &str, id: Id) -> Element<'_, WordMessage> {
         column![
             text!("{}", name),
             row![
-                text_input(id.clone().as_str(), value)
-                    .on_input({
-                        let value = id.clone();
-                        move |string| SetAdditional(value.clone(), string)
-                    })
+                jl_text_input!(name, value)
+                    .on_input(move |string| SetAdditional(id, string))
                     .width(Fill),
-                button("-")
-                    .on_press(RemoveAdditional(id.clone()))
-                    .style(danger),
+                button("-").on_press(RemoveAdditional(id)).style(danger),
             ]
             .spacing(QUARTER_SPACING),
         ]
@@ -185,13 +159,11 @@ impl WordState {
 
 #[derive(Debug, Clone)]
 pub enum WordMessage {
-    Save,
-    Back,
     Delete,
     SetTags(String),
     SetKey(String),
     SetValue(String),
-    AddAdditional(String),
-    RemoveAdditional(String),
-    SetAdditional(String, String),
+    AddAdditional(Id),
+    RemoveAdditional(Id),
+    SetAdditional(Id, String),
 }

src/pages/writing.rs

@@ -1,4 +1,5 @@
 use crate::core::kana_set::KanaSet;
+use crate::jl_button;
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::styling::*;
@@ -6,7 +7,6 @@ use iced::widget::*;
 use iced::{Element, Fill, Task, alignment};
 use rand::seq::SliceRandom;
 
-#[derive(Clone, Debug)]
 pub struct WritingState {
     kana: String,
     set: Vec<(String, String)>,
@@ -45,12 +45,8 @@ impl NavigatedPage<WritingMessage> for WritingState {
                 text!("{}", self.kana).size(48),
                 self.answers(),
                 row![
-                    button(text!("{}", self.next_text))
-                        .style(jl_button)
-                        .on_press(WritingMessage::Next),
-                    button("Закончить")
-                        .style(jl_button)
-                        .on_press(WritingMessage::Back),
+                    jl_button!(text!("{}", self.next_text)).on_press(WritingMessage::Next),
+                    jl_button!("Закончить").on_press(WritingMessage::Back),
                 ]
                 .spacing(DEFAULT_SPACING)
             ]
@@ -69,11 +65,11 @@ impl WritingState {
         let mut list = set.list();
         list.shuffle(&mut rand::rng());
         WritingState {
-            kana: "".to_string(),
+            kana: String::new(),
             set: list.clone(),
             original_set: list,
-            kana_total: "".to_string(),
-            roman_total: "".to_string(),
+            kana_total: String::new(),
+            roman_total: String::new(),
             next_text: "Дальше".to_string(),
             show_all: false,
         }
@@ -83,9 +79,9 @@ impl WritingState {
 impl WritingState {
     fn next(&mut self) {
         if self.set.is_empty() {
-            self.kana = "".to_string();
-            self.roman_total = "".to_string();
-            self.kana_total = "".to_string();
+            self.kana = String::new();
+            self.roman_total = String::new();
+            self.kana_total = String::new();
 
             self.set = self.original_set.clone();
             self.set.shuffle(&mut rand::rng());

src/styling.rs

@@ -1,7 +1,7 @@
 use iced::Element;
 use iced::border::Radius;
 use iced::widget::button::*;
-use iced::widget::{button, container};
+use iced::widget::container;
 use iced_core::Length::Fill;
 use iced_core::alignment::Horizontal::Left;
 use iced_core::{Border, Theme};
@@ -14,7 +14,7 @@ pub const BUTTON_RADIUS: f32 = 8.0;
 
 pub const SETTINGS_ICON: &[u8] = include_bytes!("../settings_icon.svg");
 
-pub fn jl_button(theme: &Theme, status: Status) -> Style {
+pub fn jl_button_style(theme: &Theme, status: Status) -> Style {
     let mut style = primary(theme, status);
     style.border = Border {
         color: Default::default(),
@@ -23,6 +23,15 @@ pub fn jl_button(theme: &Theme, status: Status) -> Style {
     };
     style
 }
+
+pub fn jl_text_input_style(
+    theme: &Theme,
+    status: iced::widget::text_input::Status,
+) -> iced::widget::text_input::Style {
+    let mut style = iced::widget::text_input::default(theme, status);
+    style.border.radius = Radius::new(BUTTON_RADIUS);
+    style
+}
 pub fn cta_button(theme: &Theme, status: Status) -> Style {
     let mut style = secondary(theme, status);
     style.border.width = 1.0;
@@ -30,12 +39,23 @@ pub fn cta_button(theme: &Theme, status: Status) -> Style {
     style
 }
 
+#[macro_export]
+macro_rules! jl_button {
+    ($content:expr) => {
+        iced::widget::button($content).style($crate::styling::jl_button_style)
+    };
+}
+
+#[macro_export]
+macro_rules! jl_text_input {
+    ($placeholder:expr, $content:expr) => {
+        iced::widget::text_input($placeholder, $content).style($crate::styling::jl_text_input_style)
+    };
+}
+
 pub fn back_overlay<'a, T: Clone + 'a>(content: Element<'a, T>, back_message: T) -> Element<'a, T> {
     container(
-        iced::widget::column![
-            button("Назад").style(jl_button).on_press(back_message),
-            content
-        ]
+        iced::widget::column![jl_button!("Назад").on_press(back_message), content]
             .spacing(DEFAULT_SPACING)
             .align_x(Left)
             .width(Fill),

src/tests.rs

@@ -0,0 +1,123 @@
+#[cfg(test)]
+mod mod_tests {
+    use crate::data::Id;
+    use crate::data::entities::{EntityData, EntityHandle};
+    use crate::data::repositories::fast_position_of;
+
+    struct ProtoEntity {
+        id: Id,
+        _data: i128,
+    }
+    impl EntityData for ProtoEntity {
+        fn id(&self) -> Id {
+            self.id
+        }
+
+        fn set_id(&mut self, id: Id) {
+            self.id = id;
+        }
+    }
+
+    impl ProtoEntity {
+        fn new(n: i128) -> Self {
+            Self {
+                id: (n as u32).into(),
+                _data: n,
+            }
+        }
+    }
+
+    #[test]
+    fn search_direct() {
+        let mut entity = EntityHandle::new(8.into(), 3, true);
+        assert_eq!(
+            fast_position_of(&[1, 2, 3, 8, 9, 12].map(ProtoEntity::new), &mut entity),
+            Some(3)
+        );
+    }
+
+    #[test]
+    fn search_0() {
+        let mut entity = EntityHandle::new(8.into(), 4, true);
+        assert_eq!(
+            fast_position_of(&[1, 2, 3, 8, 9, 12].map(ProtoEntity::new), &mut entity),
+            Some(3)
+        );
+    }
+
+    #[test]
+    fn search_1() {
+        let mut entity = EntityHandle::new(9.into(), 5, true);
+        assert_eq!(
+            fast_position_of(&[1, 2, 3, 8, 9, 12].map(ProtoEntity::new), &mut entity),
+            Some(4)
+        );
+    }
+
+    #[test]
+    fn search_2() {
+        let mut entity = EntityHandle::new(106.into(), 25, true);
+        assert_eq!(
+            fast_position_of(
+                &[
+                    1, 2, 3, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22, 23, 105, 106, 107,
+                    108, 109, 110
+                ]
+                .map(ProtoEntity::new),
+                &mut entity
+            ),
+            Some(18)
+        );
+    }
+
+    #[test]
+    fn id_0() {
+        let entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, true);
+        assert!(entity.real())
+    }
+
+    #[test]
+    fn id_1() {
+        let entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, false);
+        assert!(!entity.real())
+    }
+
+    #[test]
+    fn id_3() {
+        let entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, true);
+        assert_eq!(entity.index(), 25)
+    }
+
+    #[test]
+    fn id_4() {
+        let entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, false);
+        assert_eq!(entity.index(), 25)
+    }
+    #[test]
+    fn id_5() {
+        let mut entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, true);
+        entity.set_real(true);
+        assert!(entity.real())
+    }
+
+    #[test]
+    fn id_6() {
+        let mut entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, false);
+        entity.set_real(true);
+        assert!(entity.real())
+    }
+
+    #[test]
+    fn id_7() {
+        let mut entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, true);
+        entity.set_index(0);
+        assert_eq!(entity.index(), 0)
+    }
+
+    #[test]
+    fn id_8() {
+        let mut entity: EntityHandle<ProtoEntity> = EntityHandle::new(8.into(), 25, false);
+        entity.set_index(0);
+        assert_eq!(entity.index(), 0)
+    }
+}

src/widgets/card_display.rs

@@ -0,0 +1,107 @@
+use crate::data::entities::{CustomField, DeckSettings, WordData};
+use crate::data::Id;
+use crate::styling::HALF_SPACING;
+use iced::widget::{button, center, column, rule, text};
+use iced_core::Alignment::Center;
+use iced_core::Length::Fill;
+
+pub fn word_display<'a, T: 'a + Clone>(
+    deck: &DeckSettings,
+    word: &WordData,
+    open: bool,
+    speech_action: T,
+    fields_set: &[CustomField],
+) -> iced::Element<'a, T> {
+    column![
+        forward_side(deck, word, speech_action.clone(), fields_set),
+        rule::horizontal(2),
+        backward_side(deck, word, speech_action, fields_set, open)
+    ]
+    .into()
+}
+
+fn forward_side<'a, T: 'a + Clone>(
+    deck: &DeckSettings,
+    word: &WordData,
+    speech_action: T,
+    fields_set: &[CustomField],
+) -> iced::Element<'a, T> {
+    center(property_draw(
+        deck.forward.as_str(),
+        word,
+        speech_action,
+        fields_set,
+    ))
+    .into()
+}
+
+fn backward_side<'a, T: 'a + Clone>(
+    deck: &DeckSettings,
+    word: &WordData,
+    speech_action: T,
+    fields_set: &[CustomField],
+    open: bool,
+) -> iced::Element<'a, T> {
+    if open {
+        return center(property_draw(
+            deck.backward.as_str(),
+            word,
+            speech_action,
+            fields_set,
+        ))
+        .into();
+    }
+    center(text!("?").size(72)).width(Fill).height(Fill).into()
+}
+
+fn property_draw<'a, T: 'a + Clone>(
+    formula: &str,
+    word: &WordData,
+    speech_action: T,
+    fields_set: &[CustomField],
+) -> iced::Element<'a, T> {
+    let mut column = column![];
+    let parts = formula.split(" ");
+    println!("{:?}", formula);
+    for part in parts {
+        println!("displaying {}", part);
+        match part {
+            "key" => column = column.push(text!("{}", word.key).align_x(Center).size(48)),
+            "value" => column = column.push(text!("{}", word.value).align_x(Center).size(28)),
+            "tags" => column = column.push(text!("{}", word.tags).align_x(Center).size(28)),
+            "speech" => {
+                column = column.push(button("Воспроизвести").on_press(speech_action.clone()))
+            }
+            _ => {
+                if part == "reading"
+                    && let Some(reading) = word.additional.get(&Id(1))
+                {
+                    column = column.push(text!("{}", reading).align_x(Center).size(24));
+                    continue
+                }
+
+                if part == "description"
+                    && let Some(description) = word.additional.get(&Id(2))
+                {
+                    column = column.push(text!("{}", description).align_x(Center).size(20));
+                    continue
+                }
+
+                if part == "context"
+                    && let Some(context) = word.additional.get(&Id(3))
+                {
+                    column = column.push(text!("{}", context).align_x(Center).size(24));
+                    continue
+                }
+
+                let field_id = fields_set.iter().find(|f| f.identifier == part);
+                if let Some(id) = field_id
+                    && let Some(custom) = word.additional.get(&id.id)
+                {
+                    column = column.push(text!("{}", custom).align_x(Center).size(24))
+                }
+            }
+        }
+    }
+    column.align_x(Center).spacing(HALF_SPACING).into()
+}

src/widgets/hard_mouse_area.rs

@@ -0,0 +1,452 @@
+use iced_core::widget::{tree, Operation, Tree};
+use iced_core::{
+    layout, mouse, overlay, renderer, touch, Clipboard, Element, Event, Layout, Length, Point,
+    Rectangle, Shell, Size, Vector, Widget,
+};
+
+pub fn hard_mouse_area<'a, Message, Theme, Renderer>(
+    widget: impl Into<Element<'a, Message, Theme, Renderer>>,
+) -> HardMouseArea<'a, Message, Theme, Renderer>
+where
+    Renderer: iced_core::Renderer,
+{
+    HardMouseArea::new(widget)
+}
+
+pub struct HardMouseArea<'a, Message, Theme = iced::Theme, Renderer = iced::Renderer> {
+    content: Element<'a, Message, Theme, Renderer>,
+    on_press: Option<Message>,
+    on_release: Option<Message>,
+    on_double_click: Option<Message>,
+    on_right_press: Option<Message>,
+    on_right_release: Option<Message>,
+    on_middle_press: Option<Message>,
+    on_middle_release: Option<Message>,
+    on_scroll: Option<Box<dyn Fn(mouse::ScrollDelta) -> Message + 'a>>,
+    on_enter: Option<Message>,
+    on_move: Option<Box<dyn Fn(Point) -> Message + 'a>>,
+    on_exit: Option<Message>,
+    interaction: Option<mouse::Interaction>,
+}
+
+impl<'a, Message, Theme, Renderer> HardMouseArea<'a, Message, Theme, Renderer> {
+    /// The message to emit on a left button press.
+    #[must_use]
+    pub fn on_press(mut self, message: Message) -> Self {
+        self.on_press = Some(message);
+        self
+    }
+
+    /// The message to emit on a left button release.
+    #[must_use]
+    pub fn on_release(mut self, message: Message) -> Self {
+        self.on_release = Some(message);
+        self
+    }
+
+    /// The message to emit on a double click.
+    ///
+    /// If you use this with [`on_press`]/[`on_release`], those
+    /// event will be emit as normal.
+    ///
+    /// The events stream will be: on_press -> on_release -> on_press
+    /// -> on_double_click -> on_release -> on_press ...
+    ///
+    /// [`on_press`]: Self::on_press
+    /// [`on_release`]: Self::on_release
+    #[must_use]
+    pub fn on_double_click(mut self, message: Message) -> Self {
+        self.on_double_click = Some(message);
+        self
+    }
+
+    /// The message to emit on a right button press.
+    #[must_use]
+    pub fn on_right_press(mut self, message: Message) -> Self {
+        self.on_right_press = Some(message);
+        self
+    }
+
+    /// The message to emit on a right button release.
+    #[must_use]
+    pub fn on_right_release(mut self, message: Message) -> Self {
+        self.on_right_release = Some(message);
+        self
+    }
+
+    /// The message to emit on a middle button press.
+    #[must_use]
+    pub fn on_middle_press(mut self, message: Message) -> Self {
+        self.on_middle_press = Some(message);
+        self
+    }
+
+    /// The message to emit on a middle button release.
+    #[must_use]
+    pub fn on_middle_release(mut self, message: Message) -> Self {
+        self.on_middle_release = Some(message);
+        self
+    }
+
+    /// The message to emit when scroll wheel is used
+    #[must_use]
+    pub fn on_scroll(mut self, on_scroll: impl Fn(mouse::ScrollDelta) -> Message + 'a) -> Self {
+        self.on_scroll = Some(Box::new(on_scroll));
+        self
+    }
+
+    /// The message to emit when the mouse enters the area.
+    #[must_use]
+    pub fn on_enter(mut self, message: Message) -> Self {
+        self.on_enter = Some(message);
+        self
+    }
+
+    /// The message to emit when the mouse moves in the area.
+    #[must_use]
+    pub fn on_move(mut self, on_move: impl Fn(Point) -> Message + 'a) -> Self {
+        self.on_move = Some(Box::new(on_move));
+        self
+    }
+
+    /// The message to emit when the mouse exits the area.
+    #[must_use]
+    pub fn on_exit(mut self, message: Message) -> Self {
+        self.on_exit = Some(message);
+        self
+    }
+
+    /// The [`mouse::Interaction`] to use when hovering the area.
+    #[must_use]
+    pub fn interaction(mut self, interaction: mouse::Interaction) -> Self {
+        self.interaction = Some(interaction);
+        self
+    }
+}
+
+/// Local state of the [`HardMouseArea`].
+#[derive(Default)]
+struct State {
+    is_hovered: bool,
+    bounds: Rectangle,
+    cursor_position: Option<Point>,
+    previous_click: Option<mouse::Click>,
+}
+
+impl<'a, Message, Theme, Renderer> HardMouseArea<'a, Message, Theme, Renderer> {
+    /// Creates a [`HardMouseArea`] with the given content.
+    pub fn new(content: impl Into<Element<'a, Message, Theme, Renderer>>) -> Self {
+        HardMouseArea {
+            content: content.into(),
+            on_press: None,
+            on_release: None,
+            on_double_click: None,
+            on_right_press: None,
+            on_right_release: None,
+            on_middle_press: None,
+            on_middle_release: None,
+            on_scroll: None,
+            on_enter: None,
+            on_move: None,
+            on_exit: None,
+            interaction: None,
+        }
+    }
+}
+
+impl<Message, Theme, Renderer> Widget<Message, Theme, Renderer>
+    for HardMouseArea<'_, Message, Theme, Renderer>
+where
+    Renderer: renderer::Renderer,
+    Message: Clone,
+{
+    fn size(&self) -> Size<Length> {
+        self.content.as_widget().size()
+    }
+
+    fn layout(
+        &mut self,
+        tree: &mut Tree,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        self.content
+            .as_widget_mut()
+            .layout(&mut tree.children[0], renderer, limits)
+    }
+
+    fn draw(
+        &self,
+        tree: &Tree,
+        renderer: &mut Renderer,
+        theme: &Theme,
+        renderer_style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        viewport: &Rectangle,
+    ) {
+        self.content.as_widget().draw(
+            &tree.children[0],
+            renderer,
+            theme,
+            renderer_style,
+            layout,
+            cursor,
+            viewport,
+        );
+    }
+
+    fn tag(&self) -> tree::Tag {
+        tree::Tag::of::<State>()
+    }
+
+    fn state(&self) -> tree::State {
+        tree::State::new(State::default())
+    }
+
+    fn children(&self) -> Vec<Tree> {
+        vec![Tree::new(&self.content)]
+    }
+
+    fn diff(&self, tree: &mut Tree) {
+        tree.diff_children(std::slice::from_ref(&self.content));
+    }
+
+    fn operate(
+        &mut self,
+        tree: &mut Tree,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        operation: &mut dyn Operation,
+    ) {
+        self.content
+            .as_widget_mut()
+            .operate(&mut tree.children[0], layout, renderer, operation);
+    }
+
+    fn update(
+        &mut self,
+        tree: &mut Tree,
+        event: &Event,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        renderer: &Renderer,
+        clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, Message>,
+        viewport: &Rectangle,
+    ) {
+        if self.on_move.is_none()
+            && let Event::Mouse(mouse::Event::CursorMoved { .. }) = event
+        {
+            self.content.as_widget_mut().update(
+                &mut tree.children[0],
+                event,
+                layout,
+                cursor,
+                renderer,
+                clipboard,
+                shell,
+                viewport,
+            );
+        }
+
+        if self.on_enter.is_none()
+            && let Event::Mouse(mouse::Event::CursorEntered) = event
+        {
+            self.content.as_widget_mut().update(
+                &mut tree.children[0],
+                event,
+                layout,
+                cursor,
+                renderer,
+                clipboard,
+                shell,
+                viewport,
+            );
+        }
+        if self.on_exit.is_none()
+            && let Event::Mouse(mouse::Event::CursorLeft) = event
+        {
+            self.content.as_widget_mut().update(
+                &mut tree.children[0],
+                event,
+                layout,
+                cursor,
+                renderer,
+                clipboard,
+                shell,
+                viewport,
+            );
+        }
+
+        if shell.is_event_captured() {
+            return;
+        }
+
+        update(self, tree, event, layout, cursor, shell);
+    }
+
+    fn mouse_interaction(
+        &self,
+        tree: &Tree,
+        layout: Layout<'_>,
+        cursor: mouse::Cursor,
+        viewport: &Rectangle,
+        renderer: &Renderer,
+    ) -> mouse::Interaction {
+        let content_interaction = self.content.as_widget().mouse_interaction(
+            &tree.children[0],
+            layout,
+            cursor,
+            viewport,
+            renderer,
+        );
+
+        match (self.interaction, content_interaction) {
+            (Some(interaction), mouse::Interaction::None) if cursor.is_over(layout.bounds()) => {
+                interaction
+            }
+            _ => content_interaction,
+        }
+    }
+
+    fn overlay<'b>(
+        &'b mut self,
+        tree: &'b mut Tree,
+        layout: Layout<'b>,
+        renderer: &Renderer,
+        viewport: &Rectangle,
+        translation: Vector,
+    ) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
+        self.content.as_widget_mut().overlay(
+            &mut tree.children[0],
+            layout,
+            renderer,
+            viewport,
+            translation,
+        )
+    }
+}
+
+impl<'a, Message, Theme, Renderer> From<HardMouseArea<'a, Message, Theme, Renderer>>
+    for Element<'a, Message, Theme, Renderer>
+where
+    Message: 'a + Clone,
+    Theme: 'a,
+    Renderer: 'a + renderer::Renderer,
+{
+    fn from(
+        area: HardMouseArea<'a, Message, Theme, Renderer>,
+    ) -> Element<'a, Message, Theme, Renderer> {
+        Element::new(area)
+    }
+}
+
+/// Processes the given [`Event`] and updates the [`State`] of an [`HardMouseArea`]
+/// accordingly.
+fn update<Message: Clone, Theme, Renderer>(
+    widget: &mut HardMouseArea<'_, Message, Theme, Renderer>,
+    tree: &mut Tree,
+    event: &Event,
+    layout: Layout<'_>,
+    cursor: mouse::Cursor,
+    shell: &mut Shell<'_, Message>,
+) {
+    let state: &mut State = tree.state.downcast_mut();
+
+    let cursor_position = cursor.position();
+    let bounds = layout.bounds();
+
+    if state.cursor_position != cursor_position || state.bounds != bounds {
+        let was_hovered = state.is_hovered;
+
+        state.is_hovered = cursor.is_over(layout.bounds());
+        state.cursor_position = cursor_position;
+        state.bounds = bounds;
+
+        match (
+            widget.on_enter.as_ref(),
+            widget.on_move.as_ref(),
+            widget.on_exit.as_ref(),
+        ) {
+            (Some(on_enter), _, _) if state.is_hovered && !was_hovered => {
+                shell.publish(on_enter.clone());
+            }
+            (_, Some(on_move), _) if state.is_hovered => {
+                if let Some(position) = cursor.position_in(layout.bounds()) {
+                    shell.publish(on_move(position));
+                }
+            }
+            (_, _, Some(on_exit)) if !state.is_hovered && was_hovered => {
+                shell.publish(on_exit.clone());
+            }
+            _ => {}
+        }
+    }
+
+    if !cursor.is_over(layout.bounds()) {
+        return;
+    }
+
+    match event {
+        Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
+        | Event::Touch(touch::Event::FingerPressed { .. }) => {
+            if let Some(message) = widget.on_press.as_ref() {
+                shell.publish(message.clone());
+                shell.capture_event();
+            }
+
+            if let Some(position) = cursor_position
+                && let Some(message) = widget.on_double_click.as_ref()
+            {
+                let new_click =
+                    mouse::Click::new(position, mouse::Button::Left, state.previous_click);
+
+                if new_click.kind() == mouse::click::Kind::Double {
+                    shell.publish(message.clone());
+                }
+
+                state.previous_click = Some(new_click);
+
+                // Even if this is not a double click, but the press is nevertheless
+                // processed by us and should not be popup to parent widgets.
+                shell.capture_event();
+            }
+        }
+        Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
+        | Event::Touch(touch::Event::FingerLifted { .. }) => {
+            if let Some(message) = widget.on_release.as_ref() {
+                shell.publish(message.clone());
+            }
+        }
+        Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Right)) => {
+            if let Some(message) = widget.on_right_press.as_ref() {
+                shell.publish(message.clone());
+                shell.capture_event();
+            }
+        }
+        Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Right)) => {
+            if let Some(message) = widget.on_right_release.as_ref() {
+                shell.publish(message.clone());
+            }
+        }
+        Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Middle)) => {
+            if let Some(message) = widget.on_middle_press.as_ref() {
+                shell.publish(message.clone());
+                shell.capture_event();
+            }
+        }
+        Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Middle)) => {
+            if let Some(message) = widget.on_middle_release.as_ref() {
+                shell.publish(message.clone());
+            }
+        }
+        Event::Mouse(mouse::Event::WheelScrolled { delta }) => {
+            if let Some(on_scroll) = widget.on_scroll.as_ref() {
+                shell.publish(on_scroll(*delta));
+                shell.capture_event();
+            }
+        }
+        _ => {}
+    }
+}

src/widgets/mod.rs

@@ -0,0 +1,2 @@
+pub mod hard_mouse_area;
+pub mod card_display;